Cast
Warner Oland
Dr. Paul Cornelius
Frank Reicher
Joe Valerie
Stanley Blystone
Police Car Driver (uncredited)
Pat O'Malley
Detective Brady (uncredited)
Irving Pichel
Police Radio Announcer (voice) (uncredited)
Dorothy Wilson
Patricia Merrick, also known as Mlle. Mystera
Dudley Digges
Horace Merrick
Jane Darwell
Mrs. Marble
Ed Brady
Paddywagon Cop (uncredited)
Tom Brower
Detective Schultz (uncredited)
Max Wagner
Policeman in Car (uncredited)
Stuart Erwin
Dwight Wilson
Gertrude Hoffmann
Mattie (as Gertrude W. Hoffman)
Oscar Apfel
Chief of Detectives John F. O'Hara