- Country: USA
- Genres: Action, Crime, Drama
- Release: 1937-01-08
- Director: David Selman
- Writers: Grace Neville , Fred Niblo Jr. , Richard Sale
- Language: English
- Stars: Charles Quigley , Rosalind Keith , Rita La Roy , Henry Mollison , Wade Boteler , Ernie Alexander , Stanley Andrews , William Arnold , Hooper Atchley , Sven Hugo Borg
- Runtime: 55 min
- Awards: N/A
- AKA: Descobri a Testemunha (Portugal, Portuguese Republic) , Den mystiske Hævner (Denmark) , Le coffre magique (France, French Republic) , A Slug for Cleopatra (United States of America) , It Only Happens Once (United States of America) , O Poder da Magia (Brazil) , Find the Witness , Find the Witness (United States of America)
- Plot: Rudolph Mordini (Henry Mollison) is a Houdini-type magician who claims he couldn't have possibly murdered his wife, as he was enclosed, at the time of the killing, in a sealed locked-on-the-outside box at the bottom of the ocean. Cub newspaper reporter Larry McGill (Charles Quigley) scoops other reporters and the police by solving the crime himself.
- IMDB:tt0028871
Find the Witness Cast
David Selman
Director
Charles Quigley
Larry McGill
Rosalind Keith
Linda Mason
Rita La Roy
Rita Calmette
Henry Mollison
Rudolph Mordini
Wade Boteler
Inspector Collins
Ernie Alexander
Jerry
Stanley Andrews
District Attorney
William Arnold
Reporter
Hooper Atchley
Carney
Sven Hugo Borg
Diver