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)
James Donlan
Ernest Heath
Sidney Bracey
Pyne (as Sydney Bracey)
Clarence Geldart
John F.-X. Markham
Delmer Daves
Raymond Sperling
Nellie Bly Baker
Beedle
Marcia Mae Jones
Hungry Child in Park (uncredited)