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)