FAQ: How to Create Books with Books Maker AI — Frequently Asked Questions

Books Maker AI is an innovative platform to create books using artificial intelligence. It allows you to transform your ideas into complete books, ready for publication on Amazon KDP, Apple Books and other platforms.

The AI assists you at every stage: from structure creation to chapter writing, from editing to final formatting. It doesn't replace your creativity, but amplifies it to help you create the book you've always dreamed of.

Books Maker is designed for anyone who wants to create books, regardless of experience:

• Aspiring authors who want to write their first novel or essay
• Professionals who want to create manuals, guides or industry books
• Content creators who want to transform content into ebooks
• Experienced writers looking for a tool to speed up production
• Entrepreneurs who want to publish books for their business

Discover all the available solutions for every type of editorial project.

No, the AI doesn't replace the author. Books Maker is a collaboration tool that helps you express your ideas better. You always maintain complete creative control.

Artificial intelligence supports you with:

• Suggestions to continue when you're stuck
• Style and grammar improvements
• Chapter and plot structuring
• Character and narrative consistency

Every suggestion can be accepted, modified or rejected. The real author is always you. Discover what is AI writing and how to use it to maintain your personal voice, and learn more about how AI Book Maker works.

With Books Maker you can create any type of digital book:

Explore our blog for specific guides on each genre — for example how to write a fantasy novel — or discover our solutions for every type of book.

We recommend using the base model to learn how to use Books Maker and run initial experiments, and reserving the Premium or Ultra model to create the final version of your book. This way you get the best AI quality where it really matters, without wasting credits during the experimentation phases. Furthermore, you can use the Base model for simple books and use the higher models when you want to create more refined and complex books.

Creating books with Books Maker is simple and happens in 3 steps:

1. Share your idea: Describe the book you want to create. The AI helps you define the structure, chapters and characters.
2. Write with AI: Artificial intelligence suggests content, improves style and helps you overcome writer's block.
3. Publish and sell: Export your book in PDF, EPUB or DOCX and publish it on major platforms.

Join the wait-list to be among the first to create ebooks with Books Maker. Want the full picture? See how Books Maker works from idea to finished book.

With Books Maker you can create books in weeks instead of months. Here's a time estimate:

• Structure creation: hours instead of weeks
• First draft: 5-10 days instead of 4-6 weeks
• Revision: real-time instead of multiple cycles
• Formatting: automatic instead of manual work

Of course, timing depends on book length and the time you can dedicate. AI accelerates every phase but you decide the pace. Learn more about how to create a digital book or read our method to write a book in 1 day.

Absolutely yes! Books Maker is designed precisely to make book creation accessible to everyone. You don't need:

• Professional writing experience
• Technical formatting knowledge
• Editorial skills
• Budget for editors and ghostwriters

The AI guides you step by step, suggesting improvements and helping you develop your ideas professionally.

Read our guide on how to write an engaging story to get started.

To create a professional quality digital book with Books Maker:

1. Define your target audience and book objective
2. Create a solid structure with AI help
3. Develop content chapter by chapter
4. Review with AI to improve style and consistency
5. Export in professional format (EPUB, PDF, DOCX)

Books Maker includes advanced editing tools that would normally require expensive professional editors.

Yes! Books Maker also works as a powerful creative story generator. You can:

• Generate complete plots starting from an initial idea
• Create deep characters with backgrounds, motivations and narrative arcs
• Develop realistic dialogue between characters
• Build engaging scenes with detailed descriptions
• Maintain narrative consistency throughout the story

Unlike a simple text generator, Books Maker understands narrative structure and helps you write an engaging story from beginning to end.

Discover how our creative story generator works.

To effectively write a story with AI, follow this process:

1. Define the central concept: What is your main idea?
2. Develop the characters: The AI helps you create memorable protagonists
3. Build the structure: Beginning, development, climax, conclusion
4. Write the chapters: The AI generates content based on your outline
5. Refine and personalize: Add your personal touch

Books Maker guides you through every stage, suggesting plot twists, developing subplots and maintaining narrative pace.

Read our tips on how to write an engaging story.

Books Maker is perfect for writing autobiographies and biographies. The AI helps you to:

• Organize memories into a coherent and chronological narrative
• Identify key moments in your life or that of the person you are recounting
• Give emotional depth to lived events
• Balance personal details with narrative pace
• Create thematic chapters rather than a simple chronology

Many users use Books Maker to preserve their family history, create professional memoirs or document extraordinary lives.

Find out more about how to write a biography with AI and read our complete guide on how to write an autobiography. If instead you're thinking "I want to write a book about my life", discover how to shape your memoir.

Yes! Books Maker offers a free plan that lets you:

• Create your first complete book
• Test all the main AI features
• Export in PDF and DOCX format
• Access basic templates

This lets you write books for free and see the results before deciding whether to upgrade to a paid plan for advanced features.

You can also create content to read for free: discover where to find free books legally online or write the free books you would like to read.

Absolutely! Books Maker allows you to specify exactly your target audience and the AI will adapt style, language and content accordingly:

• Age: Children, teenagers, young adults, adults, seniors
• Cultural level: Students, professionals, industry experts
• Specific interests: Business, technology, wellness, fiction, etc.
• Desired tone: Formal, colloquial, technical, emotional, humorous

For example, you can say: "Write for managers aged 35-50 interested in leadership" and the AI will use professional terminology, business case studies and authoritative tone.

The result: A book perfectly calibrated to your ideal reader.

Books Maker can automatically adapt the same content for different audiences:

You can also create multiple versions of the same book to maximize audience.

Yes! Books Maker is excellent for creating books for children and teenagers:

• Ages 3-6: Simple stories, repetitions, basic vocabulary
• Ages 7-10: Adventures, friendship, enriched lexicon
• Ages 11-14 (middle grade): Complex plots, growth themes
• Young Adult (15+ years): Teen themes, mature styles

The AI understands pedagogical differences and cognitive development for each age, ensuring appropriate and engaging content.

Bonus: You can also specify if you want educational, adventurous, fantastic or realistic content.

Learn more about how to write children's books, how to create picture books, how to write a fairy tale with Books Maker or read our guide on how to write fairy tales for kids.

Books Maker allows writing for ultra-specific professional niches:

• Medical sector: Doctors, nurses, healthcare technicians
• Technology: Developers, data scientists, IT managers
• Legal: Lawyers, notaries, legal consultants
• Marketing: SEO specialists, social media managers, copywriters
• Education: Teachers, trainers, coaches

Specify the sector and the AI will use:

• Correct technical terminology for the sector
• Relevant and realistic case studies
• Industry-specific best practices
• Appropriate professional tone and approach

Ideal for creating technical manuals, professional guides and industry books.

With Books Maker you can create any literary genre you want:

The AI knows the conventions of each genre and helps you respect (or subvert) reader expectations.

Yes! Books Maker has deep knowledge of genre conventions:

• Mystery: Clues, suspects, final twist, detective protagonist
• Romance: Meet-conflict-resolution, happy ending, relationship focus
• Fantasy: Worldbuilding, magic systems, quests, reluctant heroes
• Sci-Fi: Futuristic worlds, advanced technology, alien civilizations, ethical dilemmas
• Thriller: Fast pace, constant tension, high stakes
• Horror: Gradual tension, unsettling atmospheres, psychological fear (horror writing guide)
• Fairy tales: Simple narrative structure, educational morals, animal characters (fairy tales guide)
• Self-help: Problem-solution structure, practical exercises, call-to-action

For example, for romance, the AI knows you need:

• Protagonists with palpable chemistry
• Credible obstacles to the relationship
• Moments of emotional intimacy
• Satisfying resolution

Result: Books that meet genre fan expectations.

Absolutely! Books Maker excels at creating hybrid and cross-genre works:

• Romantic Thriller: Suspense + love story
• Fantasy Mystery: Investigation in a magical world
• Sci-Fi Horror: Terror in space or dystopian future
• Historical Romance: Love in historical contexts
• Cozy Mystery: Light mystery + humor

The AI balances elements of each genre to create a cohesive narrative instead of a confused mix.

Example: "I want a psychological thriller with romantic elements set in ancient Rome" → AI will integrate suspense, relationships and historical accuracy.

Books Maker also supports niche genres and ultra-specific sub-genres:

• LitRPG: Fiction with video game mechanics
• Progression Fantasy: Gradual growth of protagonist's power
• Cozy Mystery: Mysteries without explicit violence
• Paranormal Romance: Love between humans and supernatural creatures
• Christian Fiction: Narrative with Christian values
• Cli-Fi (Climate Fiction): Science fiction in climate crises

For very specific genres, provide the AI with examples or key characteristics of the sub-genre and it will adapt style accordingly.

Advantage: Niche genres often have passionate fans and less saturated markets, great opportunities for emerging authors!

Writing a horror book with Books Maker is simple and engaging. The platform understands horror genre conventions and helps you build tension, create unsettling atmospheres, and develop credible characters.

The AI can assist you at every stage: from defining the type of fear (supernatural, psychological, body horror) to building narrative tension, from creating atmospheric settings to developing characters with transformation arcs.

For a complete guide to horror writing with narrative techniques, practical tips, and advice for creating stories that terrify readers, check out our horror writing guide.

Writing fairy tales and bedtime stories for children with Books Maker is an engaging experience accessible to everyone. The platform understands the conventions of both genres and helps you create stories that entertain and teach young readers.

Fairy tales (favole) use characters — often anthropomorphized animals — to convey an explicit moral lesson, set in recognizable contexts. Bedtime stories (fiabe) are set in magical, supernatural worlds with elements like fairies, witches, princes and princesses, focusing more on entertainment than direct moral instruction.

The AI can assist you at every stage: from defining the narrative structure (in medias res, progressive repetition, three acts) to creating unforgettable characters, from using morals that teach without preaching to adapting language for every age group (0-3, 4-6, 7-10 years).

For a complete guide on how to write fairy tales for children with narrative structures, engaging techniques, and AI tools, check out our fairy tales for kids guide or explore the fairy tales solution with Books Maker.

Yes! Books Maker creates three-dimensional and deep characters with:

• Detailed background: Personal history, family, formative experiences
• Clear motivations: What the character wants and why
• Credible flaws: No character is perfect
• Transformation arc: How they change throughout the story
• Unique voice: Distinctive way of speaking and thinking
• Meaningful relationships: Connections with other characters

Process: Describe basic characteristics (age, profession, goal) and the AI develops everything else, creating a character that feels real.

Readers bond with well-built characters, making your book unforgettable.

Books Maker excels at creating complex and non-stereotypical antagonists:

• Understandable motivations: Antagonist has valid reasons from their point of view
• Not just "bad guys": People with goals conflicting with protagonist
• Tragic backstory: Events that led them to become antagonists
• Credible strengths: Real challenges for the protagonist
• Moments of humanity: They're not 100% evil

Antagonist types the AI can create:

• Classic villain with deep motivations
• Moral antagonist (does wrong things for right reasons)
• Forces of nature or society as antagonist
• Protagonist's internal conflict as antagonist

A great antagonist makes a great story.

Absolutely! Books Maker handles complex casts of supporting characters:

• Allies and mentors: Characters who help the protagonist
• Sidekicks: Adventure companions with their own personalities
• Love interests: Complex and developed relationships
• Rivals: Not antagonists, but protagonist's competitors
• Supporting characters: Add color and realism to the world

The AI maintains consistency across all characters:

• Each has distinct voice and behaviors
• Relationships evolve realistically
• No confusion between similar characters
• Every character has a purpose in the narrative

Great for ensemble novels or sagas with extended casts.

Books Maker excels at creating credible and satisfying transformation arcs:

• Clear starting point: Who the character is at the beginning
• Catalyst for change: Event that triggers transformation
• Resistance to change: Character struggles against growth (realistic!)
• Turning points: Key decisions showing evolution
• New identity: Who the character becomes at the end

Arc types the AI handles:

A good emotional transformation is what makes a book unforgettable.

Yes, Books Maker is complete software for writing books and novels that includes:

• Smart editor: With real-time AI suggestions
• Project management: Organize chapters, characters, settings
• Automatic outline: Structure the book before writing
• Consistency check: Verifies timeline, names, narrative details
• Automatic formatting: Professional layout effortlessly
• Multi-format export: EPUB, PDF, DOCX

Unlike traditional software like Scrivener or Word, Books Maker integrates AI directly into the creative process, making writing faster and more effective.

It's the ideal software for both beginners and professional authors.

Also discover our comparative guide on the 3 best programs for writing books to understand which tool best suits your needs.

The artificial intelligence for writers in Books Maker is specifically designed for the literary creative process:

• Contextual assistance: The AI understands where you are in the story and suggests the next step
• Character development: Creates backgrounds, motivations and consistent dialogue
• Style improvement: Suggests more effective alternatives without changing your voice. Discover how to find your personal writing style
• Creative brainstorming: Generates ideas for plot twists, subplots, settings
• Block resolution: When you don't know how to continue, the AI proposes directions

It's not just a text generator: it's a creative co-pilot that enhances your writing skills.

You can write books with ChatGPT, but there are important limitations:

Conclusion: ChatGPT can help with paragraphs, but Books Maker is built to manage the entire book creation process from idea to publication.

No, Books Maker is much more than a simple AI text generator. It's a complete platform that includes:

• Strategic planning: Outline, structure, narrative arcs
• Content management: Chapters, sections, notes, research
• Smart editing: Not only generates, but improves and refines
• Professional formatting: Automatic layout for ebooks
• Publishing: Export in all necessary formats

An AI text generator only produces words. Books Maker produces publishable books.

It's designed with the entire editorial workflow in mind, not just content generation.

Books Maker offers a complete set of AI tools to create books:

Discover all the AI tools for creating books available.

Yes! Books Maker includes a powerful creative story maker that helps you:

• Generate ideas for original plots
• Develop complex characters with detailed backgrounds
• Create plot twists and narrative developments
• Explore different endings for your story

Learn more about creative writing techniques enhanced by AI and discover our story maker.

Books Maker supports all professional formats for publishing:

• EPUB: The standard ebook format, compatible with all readers
• PDF: Perfect for printing and digital distribution
• DOCX: For further editing in Word or other editors

Each format is optimized for the specifications of major publishing platforms.

Yes, one of Books Maker's most important features is maintaining consistency throughout the manuscript:

• Character tracking and their characteristics
• Timeline and event chronology management
• Tone and narrative style consistency
• Cross-reference verification between chapters

This is particularly useful for long novels and sagas, where maintaining consistency can be challenging.

Yes! Books Maker includes AI-powered image generation to create illustrations, cover art and visual content for your book. You can:

• Generate custom illustrations for each chapter or scene
• Create a professional book cover with AI-generated artwork
• Add visual elements like diagrams, charts and infographics
• Maintain style consistency: All images keep a cohesive visual style

This is perfect for picture books, children's books, manuals, cookbooks and any project that benefits from visual storytelling.

Absolutely! Books Maker can define and maintain the appearance of characters and settings throughout your entire book — both in text descriptions and generated images:

• Same look for the protagonist: The main character's image will always have the same features, hair color, eyes, build and style in every illustration
• Visual consistency in images: Every time you generate an image of the protagonist or a supporting character, Books Maker keeps the same visual traits across every scene
• Coherent settings: Define locations, environments and atmospheres that stay unchanged in every chapter and every illustration
• No contradictions: Say goodbye to characters changing eye color, height or clothing between chapters, or rooms shifting layout

Set the protagonist's appearance, supporting characters and settings once, and Books Maker automatically applies the same look across all scenes and illustrations throughout the book.

This is especially valuable for novels with large casts, series, comic books or illustrated books where visual consistency is crucial for reader immersion.

Result: A coherent book from start to finish where every character and setting keeps the same appearance in every scene and every generated image.

Books Maker offers three AI models, each designed for different needs. Here's what distinguishes them:

It may seem counterintuitive: you'd expect a higher plan to guarantee a faster response. In reality, the speed difference depends on the level of processing and "reasoning" the model performs before answering:

Books Maker has two simple and transparent plans:

• Starter (Free): A one-time trial to explore the platform
• Pay as you go (€10/top-up): Base model ~200 pages, premium model ~30 pages, ultra model ~15 pages. Alternatively up to 50 images (€0.20 each). Credits never expire, no limit on top-ups

Visit our pricing page for all details.

Yes! The Starter plan is free and gives you a one-time trial to explore Books Maker. You can:

• Explore all platform features
• Create the structure for your first book
• Test AI writing assistance
• Understand if Books Maker is right for you

Discover how to write free books with our platform.

No, top-ups never expire. With the Pay as you go plan:

• Base model ~200 pages, premium ~30, ultra ~15 per €10 top-up
• Or up to 50 images at €0.20 each
• No expiry — use your credits whenever you want
• No limit on the number of top-ups
• No commission on your book sales

What you see on the pricing page is what you pay.

The minimum top-up is €10. You can also make larger top-ups in multiples of €5 (€15, €20, €35, €50, etc.). Each top-up adds to your existing credit and never expires.

Books Maker prepares your book in the perfect format for Amazon KDP. The process is simple:

1. Complete your book with Books Maker
2. Export in EPUB or PDF format
3. Upload to Amazon KDP (we guide you step by step)
4. Set price and start earning

Read our complete guide on how to sell books on Amazon for all details.

You can also learn more about how to write and sell an ebook.

Books created with Books Maker can be published on all major platforms:

• Amazon KDP: The largest self-publishing platform
• Apple Books: To reach Apple users
• Google Play Books: Global distribution
• Kobo: Popular in Europe and Canada
• Your own website: Direct sales without intermediaries

Also discover where to find free online books legally to study the market.

Yes, 100%. Everything you create with Books Maker belongs to you:

• Copyright is completely yours
• You can publish where and how you prefer
• No royalties or commissions on sales
• You can use the content for any purpose

Books Maker is a tool, not a publisher. You are the author and retain all rights.

Earnings depend on several factors: genre, price, marketing and book quality. Here are some guidelines:

• Amazon KDP: Royalties from 35% to 70% of the selling price
• Ebooks from $2.99-$9.99: Best-selling price range on Amazon
• Passive income: Once published, the book can generate sales for years

Many independent authors earn hundreds or thousands of dollars per month with multiple published books.

Read the complete guide on how to write and sell an ebook.

The Books Maker team is always available to help you:

• Technical support: support@booksmaker.ai
• General information: info@booksmaker.ai
• Blog and guides: Visit our blog

We generally respond within 24-48 business hours.

Yes! We offer many resources to help you create successful books:

• Blog: Complete articles and guides
• Newsletter: Weekly writing tips
• YouTube: Video tutorials on the platform

Subscribe to the newsletter to receive exclusive tips.

To not miss news about Books Maker and tips for creating books:

• Newsletter: Subscribe here
• Wait-list: Early access to new features
• Social: Follow us on YouTube, Instagram, TikTok and LinkedIn

Absolutely yes! Thousands of authors are already earning by publishing ebooks created with AI. Opportunities include:

• Direct sales on Amazon KDP: Royalties from 35% to 70% of the selling price
• Passive income: Books continue to sell months and years after publication
• Multiple revenue streams: Amazon, Apple Books, Google Play, your website
• Scalability: Publish more books to multiply income

Many independent authors generate from hundreds to thousands of dollars per month with a catalog of 5-10 books.

Yes, publishing books is an excellent strategy to create passive income and a second revenue stream:

• Initial work, continuous earning: Once published, the book generates sales automatically
• Total flexibility: Work when and where you want
• Minimal investment: With Books Maker you can start for free
• Scalable: The more books you publish, the more your potential earnings increase

Books Maker accelerates the process allowing you to publish books in weeks instead of months, multiplying earning opportunities.

Learn more about how to write and sell ebooks.

Absolutely! A book is one of the most powerful tools to grow your business:

• Authority positioning: Being an author makes you a recognized expert in your field
• Lead generation: Use the book as a magnet to attract potential customers
• Instant credibility: A published book increases trust in you
• Evergreen content: The book continues working for you 24/7
• Differentiation: Stand out from the competition

With Books Maker you can quickly create guides, manuals or educational books specific to your professional sector. Discover our complete guide on how to write a business book.

Creating ebooks is one of the best ways to earn a second monthly income from home:

1. Choose a profitable niche: Hobbies, self-help, practical guides, genre novels
2. Create the book with Books Maker: In 2-4 weeks instead of months
3. Publish on Amazon KDP: Reaches millions of readers globally
4. Set 70% royalty: Earn €5-7 per sale at €9.99
5. Replicate the process: Create more books to multiply income

Realistic example: 3 books selling 50 copies/month each = €750-1,050/month of passive income.

This is an online second income that doesn't require constant presence: books sell while you sleep, work or are on vacation.

Bonus: The more books you publish, the more Amazon promotes your catalog for free.

With Books Maker you can sell books without writing them word by word. Here's how:

• You provide ideas and structure: Define topic, chapters, key messages
• The AI writes the first draft: Based on your outline and indications
• You review and personalize: Add examples, modify tone, refine content
• You publish as author: All rights are yours

This approach reduces writing time by 80% but maintains total creative control. It's not "copying others' content" — you're creating original content with an AI assistant.

Important: Although the AI helps with writing, you still need to add value — your expertise, real examples, unique perspective.

Many successful authors use this method to publish 6-12 books per year instead of 1-2.

The integration between KDP and AI with Books Maker is perfect for self-publishing:

• Quality requirements: The AI produces content that meets Amazon's standards
• Production speed: Publish new titles every 2-4 weeks
• Keyword optimization: The AI helps with SEO-friendly titles and descriptions
• Amazon Self Publishing earnings: 35-70% royalty of the sale price

Recommended workflow:

1. Create book with Books Maker (2-3 weeks)
2. Export to EPUB
3. Upload to Amazon KDP
4. Set price €6.99-€9.99 for 70% royalty
5. Publish and start earning

Discover all the details on how to sell books on Amazon.

Yes, it is completely legal to sell books created with AI assistance. Here's what you need to know:

• Original content: Books Maker generates unique content based on your inputs
• You are the author: You retain all copyrights to the created content
• Platform compliance: Amazon KDP and other platforms allow AI-created content
• Responsibility: You are responsible for the quality and originality of your book

Best practice: Always review generated content, personalize it with your voice and ensure it is original and valuable to readers.

Currently there is no universal legal obligation, but policies vary by platform:

• Amazon KDP: Does not require explicit declaration for AI-assisted content
• Recommended transparency: Some authors choose to mention it as best practice
• Quality first: What matters is providing real value to readers

Our philosophy: AI is a tool like an editor or proofreader. You remain the author.

Yes, the content is original and unique. Here's why:

• AI generates new text based on your specific inputs and outline
• Each book is unique because it starts from your ideas and structure
• It doesn't copy from existing sources, but synthesizes knowledge originally
• You further personalize the content with your review

Recommendation: Always use plagiarism checking tools before publishing and personalize content with examples, experiences and unique perspectives.

Books Maker is specifically designed to create complete books, while ChatGPT is a generic assistant:

In summary: Books Maker is a complete professional tool for authors, ChatGPT is a generic assistant that requires much additional manual work.

For a detailed comparison of different writing software, check out our guide to the 3 best software for writing books.

Books Maker combines the best of different tools in a single platform:

• All-in-one: From ideation to publishing, everything in one place
• Specialization: Optimized specifically for book creation
• Ease of use: Intuitive interface even for non-tech-savvy users
• Contextual AI: Artificial intelligence understands your book's context
• Professional export: Formats ready for Amazon KDP and other platforms
• English support: Platform and assistance in English language

Books Maker is a modern and accessible alternative to the traditional ghostwriter:

Key advantage: With Books Maker you maintain total creative control and learn the process, making it easier to create future books.

The choice depends on your book's goal, not on which method is "better" in absolute. We wrote a complete deep dive on this comparison, with costs, timeline, quality and a 4-question decision tree.

Read the full guide: Books creator vs traditional self-publishing: when AI wins.

Books Maker supports book creation in several languages, including:

• European: Italian, English, Spanish, French, German, Portuguese

You can also write multilingual books or translate your book into multiple languages to reach international markets.

Yes! Books Maker includes AI-assisted translation features that allow you to:

• Translate the entire book in minutes
• Maintain original formatting and structure
• Preserve narrative tone and style
• Review and customize translations

Recommended strategy: Write the book in one language and translate it into 2-3 other major languages to maximize potential market.

Books Maker exports in all necessary professional formats:

• EPUB: Universal standard for ebooks, compatible with all readers
• PDF: Ideal for professional printing and digital distribution
• DOCX: For further edits in Microsoft Word or Google Docs

Each format is automatically optimized with:

• Navigable table of contents
• Responsive formatting for different devices
• Correct metadata for digital libraries

Yes, you have complete control over style and formatting:

• Fonts and sizes: Choose from dozens of professional fonts
• Spacing: Customize margins, line spacing and paragraphs
• Narrative style: Formal, informal, technical, creative
• Templates: Pre-set models for different genres
• Cover: Integrated designer to create eye-catching covers

Even without design skills, you can create professional-looking books.