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Locked-room crime is a subgenre of detective fiction in which a crime—typically a murder but sometimes a theft or disappearance—seems to have been committed under physically impossible circumstances, for example inside a sealed room with no apparent means of entry or exit. The plot centers on the intellectual puzzle of reconciling the impossible scene with a logical method, with the investigator unmasking how the deed was done through careful observation, deduction, and the exposure of trickery, misdirection, or overlooked details. These stories emphasize clever mechanics, alibis, hidden passages or devices, and forensic or procedural sleights rather than overt violence, rewarding readers who enjoy fair-play puzzles, red herrings, and the eventual rational explanation that restores order to the baffling situation.

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