Murder! is a 1930 British mystery thriller film co-written and directed by Alfred Hitchcock, and starring Herbert Marshall, Norah Baring and Edward Chapman. Written by Hitchcock, his wife Alma Reville, and Walter C. Mycroft, based on the 1928 novel Enter Sir John by Clemence Dane and Helen Simpson, it is Hitchcock's third all-talkie film, after Blackmail (1929) and Juno and the Paycock (1930).