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A locked room mystery is a subgenre of detective fiction in which a crime, typically a murder, is committed under seemingly impossible circumstances. The crime takes place in a room or enclosed space that is completely sealed off from the outside world, with no apparent way for the perpetrator to enter or exit. The challenge for the detective is to solve the mystery of how the crime was committed and identify the culprit, despite the seemingly impossible circumstances. Locked room mysteries often involve complex puzzles, misdirection, and cleverly concealed clues that ultimately lead to the solution of the case.