Agatha Christie Wiki
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A locked-room is a plot device where a crime (typically a murder) is committed in a place where it is seemingly impossible for the perpetrator to have gained access to it or to have entered or left it without being detected. A locked-room could be a matter of physical isolation where a person is found dead in a room and the only key is in his pocket, or a matter of virtual isolation where witnesses are certain no one except the dead person entered the room. Typically, the prima facie conclusion is that the person in a locked room must have committed suicide. The challenge for the investigator is thus to show how else the person could have died.

Examples of locked-rooms in the stories of Agatha Christie

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