William Powell

Philo Vance

Mary Astor

Hilda Lake

Eugene Pallette

Detective Heath

Ralph Morgan

Raymond Wrede

Robert McWade

District Attorney Markham

Robert Barrat

Archer Coe

Frank Conroy

Brisbane Coe

Etienne Girardot

Dr. Doremus

Paul Cavanagh

Thomas MacDonald

Arthur Hohl

Gamble the Butler

Helen Vinson

Doris Delafield

Jack La Rue

Eduardo Grassi

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)

Skippy

Terrier at Dog Show (uncredited)

Leo White

Chicago Hotel Clerk (uncredited)

Renee Whitney

Telephone Operator (uncredited)

Charles C. Wilson

Detective Hennessy (uncredited)