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The Twenty Questions Murder Mystery, also known as Murder on the Air, is a 1950 British second feature comedy crime film directed by Paul L. Stein and starring Robert Beatty, Rona Anderson, and Clifford Evans. The screenplay was by Victor Katona and Patrick Kirwan. The film is a hybrid: the Twenty Questions sections take place in a studio recording of the BBC radio programme with the regular panellists and presenter. This is threaded into the plot as the clues trigger a series of murders, each linked to the clue.