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Thark is a farce by the English playwright Ben Travers. It was first given at the Aldwych Theatre, London, the fourth in the series of twelve Aldwych farces presented at the theatre by the actor-manager Tom Walls between 1923 and 1933. It starred the same cast members as many of the other Aldwych farces. The story concerns a reputedly haunted English country house. Investigators and frightened occupants of the house spend a tense night searching for the ghost.
The piece opened on 4 July 1927 and ran for nearly a year. Travers made a film adaptation, which Walls directed in 1932, with most of the leading members of the stage cast reprising their roles.