Irving Pichel
Director
Garrett Fort
Screenplay
Edgar Wallace
Story
Ralph Block
Screenplay
Marion Dix
Screenplay
Shirley C. Burden
Production Assistant
Merian C. Cooper
Production Executive
Lucien N. Andriot
Cinematography
William Hamilton
Editor
Walter Mayo
Assistant Director
Carroll Clark
Settings
Van Nest Polglase
Settings
Philip Faulkner Jr.
Sound Recordist
Joseph F. Biroc
Camera Operator
Charles Bohny
Assistant Camera
Max Steiner
Music Director
Stuart Erwin
Dwight Wilson
Dorothy Wilson
Patricia Merrick, also known as Mlle. Mystera
Warner Oland
Dr. Paul Cornelius
Dudley Digges
Horace Merrick
Gertrude Hoffmann
Mattie (as Gertrude W. Hoffman)
Oscar Apfel
Chief of Detectives John F. O'Hara
Frank Reicher
Joe Valerie
Jane Darwell
Mrs. Marble
Stanley Blystone
Police Car Driver (uncredited)
Ed Brady
Paddywagon Cop (uncredited)
Tom Brower
Detective Schultz (uncredited)
Pat O'Malley
Detective Brady (uncredited)
Ted Oliver
Police Desk Sergeant Hamilton (uncredited)
Irving Pichel
Police Radio Announcer (voice) (uncredited)
Max Wagner
Policeman in Car (uncredited)
