WriteMyBookAI

AI book writer: plan your book and draft chapter one

Describe your book idea in a paragraph. Get a chapter-by-chapter plan with word targets, plus a 600–900 word first draft of chapter 1. Export to Markdown or Word.

Try an example:

Example output for: A cozy mystery set in a seaside bakery where the baker's sourdough starter goes missing the week of a town festival

A Starter for Trouble

A Bramble Bay Bakery Mystery

Audience
Adult readers who enjoy cozy mysteries, seaside villages, amateur sleuths, and baking-centered stories with gentle humor and no graphic violence.
Genre
Fiction
Target length
40,000 words in 8 chapters

Chapter plan

  1. 1. The Empty Shelf5,000 words

    Days before Bramble Bay's Lantern Festival, baker Nell Mercer discovers that her grandmother's sourdough starter has disappeared. What initially looks like a kitchen mix-up becomes a deliberate theft when a festival official reveals that someone knew about the loss before Nell reported it.

    • Nell opens Salt & Crumb before dawn and discovers that Maud, her grandmother's sourdough starter, is missing from its usual shelf.
    • Nell and her assistant, Kit, check the bakery and find that the backup starter is also gone, while cash and equipment remain untouched.
    • They establish that the disappearance occurred after a festival committee tasting attended by four visitors, and Nell finds a brass button beside the rear entrance.
    • Festival chair Celia Vane arrives with a replacement demonstration schedule already naming a hotel baker in Nell's place, although Nell has told no one about the theft.
  2. 2. Four Guests and a Borrowed Key5,000 words

    Nell reconstructs the tasting evening while keeping the bakery running with yeasted loaves. The theft threatens both a festival appearance and a valuable year-round bread contract.

    • Nell substitutes overnight yeasted dough for her sourdough orders and explains the change honestly to disappointed regulars.
    • Celia says hotel baker Theo Pike offered to cover Nell's demonstration after hearing that she had a starter problem.
    • Nell lists the four tasting guests: Celia, Theo, flour supplier Bea Holt, and retired baker Agnes Bell.
    • Kit admits lending the rear-door key to Celia for unloading display stands; Celia insists she returned it to its hook before leaving.
    • Nell learns that the festival tasting will select the bread supplier for the town's visitor center café.
  3. 3. A Button Out of Place5,000 words

    The brass button points toward the grand harbor hotel, but a second apparent clue sends Nell toward her flour supplier. A photograph preserves a detail Nell initially overlooks.

    • Nell visits the Harbor House Hotel and recognizes the brass button as a match for its staff jackets.
    • Theo shows Nell his intact jacket and claims his own starter has been maintained for years.
    • Hotel owner Marina Shaw reveals that Theo has promised to win the visitor center contract despite two recent failed test bakes.
    • Bea admits arguing with Nell's grandmother about an unpaid flour invoice but produces proof that the debt was settled.
    • A festival volunteer gives Nell photographs from the tasting, including one showing Theo wearing an older jacket with a loose cuff button.
  4. 4. The Woman Who Knew Maud5,000 words

    Agnes reveals the starter's history and helps Nell distinguish sentimental assumptions from useful evidence. Meanwhile, the thief's early warning begins to unravel.

    • Agnes admits asking to take Maud home because she distrusted the bakery's new refrigerator, but says Nell's grandmother taught her never to move another baker's starter without permission.
    • Agnes identifies a crescent-shaped flaw in Maud's blue glass jar from an old photograph.
    • Nell checks her grandmother's notebook and confirms that the starter is fed a distinctive blend containing rye.
    • Celia shows Nell Theo's timestamped message about Nell being unable to bake, sent before the bakery opened.
    • Theo explains the message as a misunderstanding of something Kit said during the tasting; Kit denies discussing any starter trouble.
  5. 5. Cold Storage5,000 words

    A suspicious loaf and an overlooked delivery route narrow Nell's search. She brings the evidence to the local constable rather than confronting anyone alone.

    • At a public festival rehearsal, Theo describes his competition loaf as pure wheat sourdough, but its display card lists rye among the ingredients.
    • Theo calls the card a printing error, while Nell notices that the loaf resembles his failed test recipe rather than her grandmother's.
    • Bea confirms delivering Theo's small rye order to the hotel's rented boathouse cold room after the tasting.
    • A harbor delivery driver's dashcam shows a hotel-coated figure carrying a covered crate from the bakery alley, though the face is hidden.
    • Nell gives Constable Ruth Dacre the photograph, message timeline, button, and delivery details; Ruth agrees to make formal inquiries.
  6. 6. The Jar in the Boathouse5,000 words

    With the hotel owner's permission, Ruth inspects the boathouse cold room. The missing starter is recovered, but Theo insists the theft was an innocent borrowing.

    • Marina authorizes Ruth to inspect the hotel's rented cold-storage space and invites Nell to identify any bakery property.
    • Nell recognizes Maud's crescent-flawed jar behind covered catering trays, alongside her labeled backup tub.
    • Ruth documents the containers before they are returned, and Nell checks whether the chilled starter can be revived.
    • Theo admits taking the containers but claims Nell consented during the noisy tasting.
    • Kit finds the tasting's continuous audio recording, made with guests' knowledge for a festival baking podcast, which may test Theo's account.
  7. 7. Proof Before Proving5,000 words

    The recording and a precise reconstruction establish deliberate sabotage rather than a misunderstanding. Nell learns why Theo targeted the backup as well as the main starter.

    • The recording captures Nell explicitly refusing Theo's request to borrow Maud before she steps into the shop to serve a customer.
    • In the same recording, Theo asks Kit where spare starter is kept, claiming to be helping clear the workbench.
    • Confronted by Ruth with the evidence, Theo admits using the borrowed rear-door key before Celia returned it and carrying both containers away under his spare jacket.
    • Theo explains that he hoped Nell would withdraw, allowing him to secure the visitor center contract while using Maud to improve his own entry.
    • Ruth records Theo's admission and refers the theft for appropriate legal action; Marina removes him from festival duties, and Nell refuses to disguise what happened as a harmless prank.
  8. 8. A Loaf for the Lanterns5,000 words

    With Maud active again, Nell returns to the festival on her own terms. The bakery's future rests on skill and community rather than a supposedly magical ingredient.

    • Nell and Kit refresh small portions of Maud over several feedings and complete a successful test bake.
    • Celia restores Nell's demonstration slot and publicly corrects the claim that Salt & Crumb had withdrawn.
    • Nell demonstrates fermentation, explaining that a mature starter cannot replace practice, timing, or sound technique.
    • Salt & Crumb wins the visitor center contract in a blind tasting, and Nell offers Bea a standing flour order and Kit a paid training role.
    • After the lantern procession, Nell stores a new backup with Agnes and finds a customer note hinting at another small-town puzzle.

Chapter 1, first draft: The Empty Shelf

At half past four on Monday morning, the sea was invisible, but Nell Mercer could hear it rearranging the pebbles beyond the harbor wall.

She unlocked Salt & Crumb, shouldered the door against its usual objection to damp weather, and stepped into the comforting smell of flour, butter, and yesterday's coffee. Across the street, festival bunting snapped between two lampposts. One string had come loose overnight, leaving a row of yellow flags pointing accusingly at the fishmonger.

“Four days,” Nell told the dark shop. “We can survive anything for four days.”

This was the sort of remark her grandmother would have advised against making within hearing distance of the universe.

Nell switched on the kitchen lights, tied her apron, and reached for the blue glass jar on the shelf beside the mixer.

Her hand closed on nothing.

She looked properly then. The shelf held the kitchen scales, a folded tea towel, and the chipped china hen in which her grandmother had kept emergency peppermint sweets. Between the scales and the hen was a clean circle in the flour dust.

Maud was missing.

For a moment, Nell simply stood there with her arm raised, as though the jar might materialize if she maintained the correct posture.

Maud was older than Nell, older than the bakery's oven, and considerably more reliable than either. Her grandmother had started the culture thirty-two years ago and named it after a sister who, according to family tradition, also became difficult when not fed regularly.

Nell checked behind the mixer.

Then she checked the shelf again.

The rear door opened, admitting a gust of salt air and Kit Rowan, carrying a bicycle helmet and a paper bag.

“Peace offering,” Kit said. “I ate the last cheese twist yesterday. These are apples, which I appreciate are not equivalent.”

“Have you moved Maud?”

Kit stopped smiling. “Why?”

“Because I'm hoping the answer is yes.”

They searched the kitchen with increasing thoroughness and decreasing dignity. Kit looked in the flour bins. Nell checked beneath the sink, although no one who valued their employment would put a starter beside the drain cleaner.

“Backup,” Kit said.

“Bottom refrigerator drawer.”

He crouched, opened it, and went quiet.

Nell joined him. The shallow tub labeled MAUD JUNIOR—DO NOT TURN INTO SOUP was gone. Two lemons and a wrapped block of butter occupied the drawer with perfect innocence.

“The till?” Kit asked.

Nell went through to the shop. Yesterday's float was untouched. Her grandmother's silver cake knife remained in the display cabinet. The expensive new stick blender sat beside the sink.

Someone had passed over money, silver, and a motor with twelve speed settings in favor of fermented flour.

Nell returned to the kitchen and opened the order book. Forty-eight sourdough loaves were due on Tuesday. On Friday she was supposed to demonstrate her grandmother's harbor loaf at the Lantern Festival.

“We can make bread,” she said. “We've got yeast. Nobody's breakfast is being held hostage.”

“What about the demonstration?”

“One disaster at a time.”

Kit rubbed a hand over his face. “I fed her after the committee tasting. Just after eight. I remember because Agnes said I was stirring too energetically.”

Nell pulled yesterday's worksheet toward her and wrote four names in its margin.

Celia Vane, festival chair. Theo Pike, the Harbor House Hotel's new baker. Bea Holt, who supplied their flour. Agnes Bell, retired baker and active critic of almost everything.

Four visitors, all gathered around the workbench to taste potential festival breads.

“I locked the front at half past eight,” Nell said. “You left through the back?”

“And checked it caught.”

The rear lock showed no obvious damage. Nell opened the door and examined the threshold. Something small and gold-colored lay against the skirting board behind a stack of empty bread trays.

She bent closer without touching it.

A brass button, stamped with an anchor.

“Is that ours?” Kit asked.

“My wardrobe doesn't generally have a nautical command structure.”

The shop bell rang before he could answer.

Celia Vane stood outside the glass door in a lemon-yellow raincoat, holding a clipboard beneath one arm. Nell let her in.

“Good, you're here,” Celia said. “I've reorganized Friday. No need to worry about your demonstration.”

She placed a printed schedule on the counter.

Where Nell's name should have been, someone had typed THEO PIKE: THE PERFECT SEASIDE SOURDOUGH.

Nell read it twice.

“Celia. Why would my demonstration need reorganizing?”

“Well, with your starter gone—”

Behind Nell, the kitchen door creaked. Kit stood in the opening, very still.

Outside, a gull landed on the windowsill and struck the glass with its beak.

Nell rested one floury finger on the new schedule.

“That's interesting,” she said. “We haven't told anyone.”

This is a book plan plus a first draft of chapter 1, not a finished book. Edit, rewrite and add your own voice.

Free use is 1 book plan per visitor per day, and the whole site has a daily capacity limit.

How do you turn a paragraph into a book plan?

  1. Start with a premise or subject. Use the bakery mystery example, describe your own fiction idea, or explain the subject and audience for a nonfiction book.
  2. Generate the plan and opening chapter. You get a title and subtitle, an intended audience, and 8–14 chapters, each with 3–6 concrete beats and a word target.
  3. Read the draft, then export. Chapter 1 contains 600–900 words of drafted prose. You can export your plan to Markdown or Word (.docx).

What can you try with the example idea?

The bakery mystery gives you a specific starting point: a missing sourdough starter, a seaside bakery, and a town festival approaching. Generate it to inspect a chapter-by-chapter outline and read the opening prose, rather than judging the output by word counts alone.

In a run on October 4, 2026, that premise produced "A Starter for Trouble", an 8-chapter plan targeting 40,000 words, with a 784-word first chapter.

Here is how that run compared with two other examples generated that day. These are planned book lengths, not completed manuscripts.

Book idea Chapters Planned book length Chapter 1 draft
Seaside bakery mystery, "A Starter for Trouble" 8 40,000 words 784 words
Practical guide for first-time managers in small startups 10 30,000 words 804 words
Children's chapter book for ages 8–10 10 12,000 words 790 words

What gets checked before you see your plan?

An AI model accessed through OpenRouter writes the plan and first chapter. Our own code checks:

A plan that fails these checks is regenerated once.

How long it takes

Writing the plan and the first chapter together usually takes about two minutes. The progress bar shows the elapsed time; keep the tab open until the result appears.

How much does WriteMyBookAI cost?

If you need more than one free plan a day, choose a monthly subscription or a one-time pack.

Option Price Book plans
Free $0 1 per day per visitor, without signup
Monthly subscription $9.90 per month 60
One-time pack $4.90 15

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What should you know before generating a plan?

A 40,000-word target does not mean 40,000 drafted words. You get chapter targets for the planned book. The drafted prose is chapter 1, at 600–900 words.

Structure checks check counts and lengths. Read the chapter beats and opening prose to decide whether they give you a starting point you want to use.

Your ideas and plans are not stored in a database. Your idea text is sent to an AI model through OpenRouter to create the plan.

FAQ

Does it write my whole book?

No. You get a full chapter-by-chapter plan and a first draft of chapter 1 only. The rest of the writing is yours.

Is it free?

Yes: 1 book plan per day without signing up. Paid plans add more; see the pricing page.

Why does it take two minutes?

The model writes the complete plan and about 800 words of prose in one go, and our code checks the result before showing it. If it fails a check it is rewritten once, which can take longer.

Can I choose fiction, nonfiction or a children's book?

Yes. Pick a book type and a target length (about 12,000 to 80,000 words), or let the AI decide from your idea.

What formats can I export?

Markdown (.md) and Word (.docx). Both contain the plan and the chapter 1 draft.

Who owns the text?

We claim no rights in the plan or draft generated for you. You are responsible for how you use it, including checking that it does not copy anyone else's work and following any rules about disclosing AI assistance.

Can I use it for school or university assignments?

No. WriteMyBookAI is not for essays, theses or any work submitted for academic credit.

Do you keep my idea?

We do not store your idea or the result in a database. To write the plan, your idea is sent to an AI model through OpenRouter, which handles it under its own privacy terms.

Why did my request fail?

Sometimes the model's output fails our structure checks twice, or the model is busy. Failed attempts do not count against your free or paid book plans. Try again, add a little more detail, or pick a length.