The Train’s Anonymous Message
A fast-paced narrative about two strangers on a train who receive an anonymous message at the same time: "Do exactly as I say or everyone on this train dies." They need to figure out the messenger's motives and stop a disaster, all while figuring out how interconnected their lives are.
Suggested length: A short story: 1,500 to 5,000 words, or flash fiction under 1,000
Start the clock
Pick a sprint, press start and keep going until it stops. Momentum beats polish on a first draft.
Make it yours
Three ways to take this prompt somewhere nobody else will.
- Put a clock on it: the hero has until midnight.
- Trap your hero in one place they can't easily leave.
- Raise the stakes from personal to public halfway through.
Writing thriller books
Something terrible is coming. Can they stop it in time?
Where a mystery looks back at a crime, a thriller looks forward at a threat. The reader often knows more than the hero, and the tension comes from watching danger close in. Short chapters, high stakes and a ticking clock are the tools of the trade.
What readers expect
- A clear, escalating threat
- A hero under pressure
- Twists and reversals
- Pace: little time to breathe
A tip before you start
Put a clock on it. A deadline the reader can count down turns every scene into a race.
More Action Thriller prompts
- The Cruise Ship DisappearancesA retired secret agent on a transatlantic cruise to Europe notices suspicious behavior among the crew. When passengers start disappearing, the retired…
- The Commuter Plane BombWrite a nail-biting tale about a pilot of a small commuter plane who discovers a bomb on board. With nowhere to land and time running out, the pilot…
- The Framed Secret AgentCreate a story where a secret agent is framed for a crime they didn't commit. While on the run, they must use their skills to clear their name…
- The Drone on the PeakWrite a story about an expert mountain climber who discovers a crashed drone carrying sensitive information on a remote peak. As they descend, they…
Fifteen minutes in? Keep going.
Chapterly gives a draft somewhere to grow: chapters, daily word goals, and readers when you're ready.
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