A rich widow gets killed and Vole (Power), her lover, is suspected of murder. The only hope for the man to clear his name is that his wife (Dietrich) witnesses in his favor, but also the woman has some secrets to protect. Based on a play by Agatha Christie, Witness for the Prosecution, the movie is a tensed drama that won six Oscars: Best Picture, Best Actor in a Leading Role (Laughton), Best Actress in a Supporting Role (Lanchester), Best Director, Best sound Recording, Best Film Editing.