Write a Novel with AI in 90 Days: Beginner’s Step-by-Step 2026 Guide

Quick Answer

Write a novel with AI by using it for plotting (Save the Cat structure), character bibles, scene drafts, and continuity — but rewrite every sentence in your voice.

Plot first, draft second — pantsing fails with AI
Write 2,000 words/day for 45 days = 90k novel
AI drafts the mortar; you lay the bricks

What You'll Need

A novel premise (logline + genre)
Sudowrite, Assisters, or Claude
Scrivener or Plottr for structure
A character bible template
90 days of daily writing

Step 1: Lock the Premise and Stakes

Logline: "[Character] must [goal] or [consequence]." Example: "A single mom must find her missing daughter in 72 hours or the kidnapper disappears forever."

Stakes = what happens if they fail. Make them irreversible.

Step 2: Plot Using Save the Cat Beats

Prompt AI: "Plot my thriller using Save the Cat's 15 beats. Logline: [yours]. Give me 1 paragraph per beat." Review, revise, save to Plottr.

Step 3: Build Character Bibles

For each main character, prompt: "Create a character bible for [name]. Include: age, physical, flaw, want, need, wound, contradictions, voice sample. Make them 3D."

Save in Scrivener "Characters" folder.

Step 4: Outline Every Scene Before Drafting

60-scene outline for a 90k novel. Each scene: POV, goal, conflict, disaster. Prompt: "Expand Beat 7 (midpoint) into 5 scenes. Each scene: POV, goal, obstacle, outcome, emotional shift."

Step 5: Draft 2,000 Words/Day

Per scene: "Draft Scene 12 in [author voice, e.g., Tana French — lyrical, introspective]. POV: Sarah. Goal: confront the detective. 1,500 words. End on a question."

Rewrite EVERY paragraph in your voice. AI is the skeleton; you add the muscle.

Step 6: Maintain Continuity

Every 5 chapters, prompt: "Here's Chapters 1-5 [paste]. Flag any continuity errors, character voice drift, or plot contradictions." AI catches what you miss.

Step 7: Final Self-Edit

After first draft, 2-week break. Then prompt: "Critique Chapter 3 for pacing, dialogue authenticity, POV consistency, filter words. Suggest 3 specific improvements."

Step 8: Human Editor Pass

Hire a developmental editor ($1,500-3,500) for structural feedback. AI can't replace a human editor's instinct for what makes readers cry.

Common Mistakes to Avoid

Letting AI write whole scenes verbatim — voice dies
Skipping the beat sheet ("I'll figure it out")
Using generic AI character descriptions (flat)
Not tracking continuity (chapter 22 contradicts chapter 4)
Publishing without a human editor

Top Tools

Tool	Use Case	Free Tier	Best For
Sudowrite	Fiction-specific AI	Trial	Scene generation
Assisters	Full workflow	Yes	Plot + draft + edit
Plottr	Visual plotting	Trial	Beat sheets
Scrivener	Manuscript tool	Trial	Organization
ProWritingAid	Line editing	Yes	Clean prose