Before Dawn

Dwight Wilson

Patricia Merrick, also known as Mlle. Mystera

Dr. Paul Cornelius

Horace Merrick

Mattie (as Gertrude W. Hoffman)

Chief of Detectives John F. O'Hara

Joe Valerie

Mrs. Marble

Police Car Driver (uncredited)

Paddywagon Cop (uncredited)

Detective Schultz (uncredited)

Detective Brady (uncredited)

Police Desk Sergeant Hamilton (uncredited)

Police Radio Announcer (voice) (uncredited)

Policeman in Car (uncredited)