Walter Connolly

Father Brown

Paul Lukas

Flambeau

Gertrude Michael

Evelyn Fischer

Robert Loraine

Inspector Valentine

Halliwell Hobbes

Sir Leopold Fischer

Una O'Connor

Mrs. Boggs

E. E. Clive

Sergeant Dawes

Robert Adair

Policeman (uncredited)

Alyce Ardell

Maid (uncredited)