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 film is an unusual 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.