Before Dawn - 5.6★

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)

Irving Pichel - Police Radio Announcer (voice) (uncredited)