A whodunit is a type of MYSTERY novel or film in which the audience is presented with a crime and must follow the clues to determine who committed it. The term was coined in the 1920s and has been used ever since to refer to stories that involve a puzzle-solving element. Whodunits often feature an amateur detective, such as Miss Marple or Sherlock Holmes, who must use their wits to solve the case. They are popular among readers and viewers alike, as they provide an exciting challenge and allow the audience to become involved in the story.