About this tool
A murder mystery is a machine for questions: who had motive, who lied, what the room proves. This generator takes a setting, a crime hook, and a tone, then returns suspects with secrets, a clue map, red herrings, and reversal options — fair-play scaffolding, not a spoilered ending unless you paste your solution.
How to use it
- Pick a genre lane and a tone (cozy, noir, procedural, golden age, domestic) so the harm and the investigator match.
- Write a setting with a clock: a weekend house party, a night crossing, a town with one bridge.
- Describe the crime as a reader would first hear it — not your full solution.
- Generate, assign the killer yourself, then delete or rewrite any suspect the model marked too obviously guilty.
Examples
Input
Genre: Mystery · Setting: 1938 manor · Tone: golden age · Host dies after toast, locked study
What you get
Six suspects with secrets, fair-play clues (paint on the latch, wrong wine glass), two midpoint reversals that reframe the locked room.
Input
Genre: Mystery · Setting: contemporary bookshop town · Tone: cozy · Victim found in the closed shop
What you get
Community suspects, red herrings that look like motive but are about debt or pride, investigator with a local tie.
Input
Genre: Science Fiction · Setting: rotating habitat · Tone: procedural · Engineer dead before a vote
What you get
Evidence chain under artificial gravity rules, suspects bounded by airlock logs, clues tied to station constraints.
Fair play without a spoiled ending
Clues before confessions
If the output hands you a killer, treat it as a draft suspect. You still need to plant what the reader can notice.
Every suspect gets a secret
Guilt is one secret. Debt, shame, and cover-ups for someone else are the others that keep interviews alive.
Red herrings must be fair
A herring should look like motive because of something true — not because the author lied about physics.
Tone is a promise
Cozy harm stays contained. Noir needs a compromised lead. Procedural needs an institution that can fail.
Avoid
- Asking for “a twist ending” with no crime — you will get a parade of clichés.
- Accepting a second body or a serial killer the premise did not need.
- Using the output as canon before you pick the killer and walk the clue trail yourself.