- A whodunit is a mystery centered on identifying the culprit.
- The central question is "who did it?"
- It relies on clues, suspects, and red herrings.
- Fair play lets the reader theoretically solve it.
- It is a classic subgenre of detective fiction.
A whodunit (from "who done it?") is a mystery in which the central question is the identity of the culprit — usually the perpetrator of a crime, often a murder. The story revolves around clues, a cast of suspects, red herrings, and an investigator working toward the reveal. The defining feature is fair play: the reader should, in principle, be able to solve it from the clues provided. A staple of classic detective fiction, the whodunit is built around the satisfying puzzle of "who did it, and how."
Chapter i·Why it matters
The whodunit is a foundational mystery form with specific conventions — fair-play clueing, suspects, a logical solution — that writers must understand to satisfy the genre's devoted readers. Knowing what defines a whodunit (the central identity question and the fair-play contract) helps writers construct mysteries that play fair and deliver the puzzle-solving satisfaction readers seek. It clarifies a core mystery structure, distinct from thrillers or other crime fiction where the culprit may be known.
Chapter ii·What to include
- A mystery centered on the culprit's identity.
- The "who did it?" question.
- Clues, suspects, and red herrings.
- Fair play for the reader.
- A logical, satisfying solution.
- Its place in detective fiction.
Chapter iii·Example
A writer plans a whodunit: a murder, a closed circle of suspects each with motive, a trail of clues and red herrings, and a detective who assembles them. She clues it fairly so an attentive reader could solve it. The central question — who did it? — and the fair-play puzzle define it as a whodunit.
Chapter iv·Related questions
WriteLoom's Plan studio tracks your clues, suspects, and solution, so a whodunit plays fair and satisfies.
See the Plan studio