Mystery Writing Prompts
A mystery prompt should give you a contradiction: a fact that cannot be true and a roomful of people who insist it is. Pick the lie that interests you most and write the detective who can't leave it alone.
- 01
The victim's smartwatch logged a heart rate for six hours after the coroner's time of death — climbing stairs the house doesn't have.
- 02
A famous recluse dies, and his obituary — submitted by him, last week — names his murderer. The named man has an airtight alibi: he died first.
- 03
Every member of the book club received the same novel with a different ending. The author has been missing since chapter nine happened, in real life.
- 04
The town's only locksmith is found inside a vault she didn't make, locked from the outside, holding a key to a door no one can find.
- 05
A wedding photographer notices the same uninvited guest in the background of seven different weddings — always looking at the camera.
- 06
The lighthouse keeper's log records a shipwreck that never happened — names, cargo, survivors. Then a survivor knocks on the door.
- 07
Your detective's cold case is solved by an anonymous letter that includes a detail only the killer could know — and a detail only your detective could know.
- 08
A small museum's painting is stolen and returned overnight, every full moon, slightly different each time. The curator has started photographing the changes.
- 09
The translator hired for a deathbed confession realizes the dying man is confessing to a crime committed against her family — and lying about it.
- 10
All four witnesses describe the suspect perfectly: same scar, same coat, same limp. The descriptions match the lead detective, who was on a plane.
- 11
An estate sale includes ninety-one identical diaries, each ending mid-sentence on the same date, written in ninety-one different hands.
- 12
The crossword in the local paper starts spelling out where to dig. The editor swears the setter died in 1987. The clues are getting recent.