For mystery writers
Plan and write your mystery with AI
Pitch the crime in a sentence or two. FictionAI drafts a story bible (setting, suspects, detective, chapter outline) that you edit, then writes each chapter with the whole case in view.
3 books free, no credit card. AI use is billed by OpenRouter to your own account.
What you get for a mystery
A mystery-shaped outline
Pick the "puzzle solved step by step" story shape (mystery structure) or let FictionAI choose the best fit for the genre.
Suspects with motives
The cast holds each suspect’s description, backstory, motivation and secrets. Edit them or add more.
Clues in the outline
Every outline chapter lists key events; write your clues and red herrings there so the chapters that follow set them up.
A detective who carries on
Your detective is in the cast with an arc, and each chapter is written from the bible and the chapters before it.
Setting and atmosphere
The world card holds the setting, time period and locations, from a village fête to a city precinct.
Mystery tropes
Chips such as locked room, amateur detective, red herring, cold case, unreliable narrator and murder at the manor.
How it works
- 01
Build your case
Choose Mystery, Cozy Mystery, Crime or Detective, pitch the crime, and pick tropes.
- 02
Story bible
One click builds premise, title, world, cast and outline. Decide the culprit and move clues between chapters.
- 03
Write
Generate chapters one at a time; rewrite a passage to hide a clue better or revise the whole chapter.
- 04
Export
Download the manuscript as DOCX, PDF, Markdown, plain text or HTML.
Questions
Can AI write a convincing mystery?
It can draft one from a plan you check. The fairness of a mystery lives in the outline, so FictionAI builds that first and lets you edit who did it, which clues appear where and when the reveal comes, before any chapter is written.
How does FictionAI handle clue planting?
Write clues into the key events of the outline chapters. Each chapter is written from the story bible, its outline entry and the earlier chapters, so planted details are there for the reveal. There is no automatic clue tracker; editorial review can flag loose threads across the book.
Does it support cozy mysteries?
Yes. Cozy Mystery is a built-in genre with its own defaults for tone and audience.
Can I plan red herrings?
Yes. Red herring is a trope chip, and you can put each false lead in the outline and give the suspect a motive in the cast so it holds up.
What mystery subgenres work best?
Mystery, Cozy Mystery, Crime and Detective are built-in genres. Police procedurals, private investigators and locked-room puzzles are trope chips. Anything else can be named in the pitch and notes.