William Powell
Philo Vance
Eugene Pallette
Detective Heath
Ralph Morgan
Raymond Wrede
Robert McWade
District Attorney Markham
Etienne Girardot
Dr. Doremus
Paul Cavanagh
Thomas MacDonald
Arthur Hohl
Gamble the Butler
Helen Vinson
Doris Delafield
Jack La Rue
Eduardo Grassi
Harry Allen
Sandy (uncredited)
Wade Boteler
Desk Sergeant Mellish (uncredited)
Don Brodie
Police Photographer (uncredited)
James Burke
Policeman Who Lets Dog Out (uncredited)
George Chandler
Reporter at Police Station (uncredited)
Spencer Charters
Sergeant Snitkin (uncredited)
Virginia Dabney
Girl (uncredited)
Milton Kibbee
Reporter (uncredited)
Harry Morgan
Gamble (uncredited)
Henry O'Neill
Dubois (uncredited)
Paul Panzer
Baggage Clerk (uncredited)
Cliff Saum
Policeman on Night Patrol (uncredited)
Skippy
Terrier at Dog Show (uncredited)
Arthur Thalasso
Detective (uncredited)
Monte Vandergrift
Detective (uncredited)
Leo White
Chicago Hotel Clerk (uncredited)
Renee Whitney
Telephone Operator (uncredited)
Charles C. Wilson
Detective Hennessy (uncredited)