Before Dawn

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)