Actress Edna Druce is found dead, and fellow thespian Diana Baring can't explanation why she's holding the murder weapon. Diana seems destined for conviction and the death penalty, but juror Sir John Menier thinks she's innocent. John collects clues and revisits the crime scene in an attempt to clear Diana.

Directed by Alfred Hitchcock. A juror in a murder trial, after voting to convict, has second thoughts and begins to investigate on his own before the execution.