Basil Rathbone

Philo Vance

Leila Hyams

Belle Dillard

Roland Young

Sigurd 'Erik' Arnesson

Alec B. Francis

Professor Bertrand Dillard

George F. Marion

Adolph Drukker

Zelda Sears

Mrs. Otto Drukker

Bodil Rosing

Grete Menzel

Carroll Nye

John E. Sprigg

Charles Quatermaine

John Pardee (as Charles Quartermaine)