Warren William
— Philo Vance
Margaret Lindsay
— Bernice Stamm
Lyle Talbot
— Gale Leland
Eugene Pallette
— Sgt. Ernest Heath
Helen Lowell
— Mother Stamm
Robert McWade
— District Attorney Markham
Robert Barrat
— Rudolph Stamm
Dorothy Tree
— Ruby Steele
George E. Stone
— Ken Tatum
Etienne Girardot
— Dr. Doremus - Coroner
George Meeker
— Monty Montague
Robert Warwick
— Dr. Halliday
William B. Davidson
— Greeff
Arthur Aylesworth
— Trainor - Stamm's Butler
Charles C. Wilson
— Det. Hennessey
Cliff Saum
— Det. Burke (uncredited)
Milton Kibbee
— Service Station Attendant (uncredited)
Wilfred Lucas
— Police Sergeant (uncredited)
Eric Wilton
— Currey - Vance's Butler (uncredited)
Bruce Mitchell
— Commander (uncredited)
Eddie Shubert
— Detective (uncredited)
Sam McDaniel
— Steam Room Attendant (uncredited)