Blackmail

John Longden

Detective Frank Webber

Donald Calthrop

Tracy

Cyril Ritchard

The Artist

Hannah Jones

The Landlady

Harvey Braban

The Chief Inspector

Ex-Det. Sergt. Bishop

The Detective Sergeant

Alfred Hitchcock

Man on Subway (uncredited)

Johnny Ashby

Boy (uncredited)

Joan Barry

Alice White (voice) (uncredited)