Full Credits
15 members

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)
16 members
Walter Mayo
Assistant Director
Irving Pichel
Director
Marion Dix
Screenplay
Ralph Block
Screenplay
Garrett Fort
Screenplay
Edgar Wallace
Novel
Merian C. Cooper
Production Executive
Shirley C. Burden
Production Assistant
Charles Bohny
Assistant Camera
Joseph F. Biroc
Camera Operator
Max Steiner
Music Director
Philip Faulkner Jr.
Sound Recordist
Carroll Clark
Settings
Van Nest Polglase
Settings
William Hamilton
Editor
Lucien N. Andriot
Cinematography