Witness for the Prosecution is a 1957 American film co-adapted and directed by Billy Wilder and starring Tyrone Power, Marlene Dietrich, Charles Laughton, and Elsa Lanchester. The film, which has film noir elements, depicts an English courtroom drama. Set in the Old Bailey in London, the picture is based on the play of the same name by Agatha Christie and deals with the trial of a man accused of murder. The first film adaptation of Christie’s story, Witness for the Prosecution was adapted for the screen by Larry Marcus, Harry Kurnitz and Wilder. The film received positive reviews.