Paul Lukas

Philo Vance

Alison Skipworth

Priscilla Kinkaid Llewellyn

Donald Cook

Lynn Llewellyn

Rosalind Russell

Doris Reed

Arthur Byron

Richard Kinkaid

Ted Healy

Police Sergeant Ernest Heath

Eric Blore

Currie

Isabel Jewell

Amelia Llewellyn

Louise Fazenda

Becky

Purnell Pratt

District Attorney John Markham (as Purnell B. Pratt)

Leslie Fenton

Dr. Kane

Louise Henry

Virginia Llewellyn

Leo G. Carroll

Smith (as Leo Carroll)

Charles Sellon

Dr. Doremus

Ernie Adams

Husband of Fat Lady at Auction (uncredited)

Brooks Benedict

Casino Patron (uncredited)

Edna Bennett

Nurse to Lynn (uncredited)

Sidney Bracey

Waiter (unconfirmed) (uncredited)

Wallis Clark

Dr. Elton (uncredited)

William Demarest

Auctioneer (uncredited)

Jay Eaton

Auction Floorman (uncredited)

Lillian Elliott

Mrs. Marting (uncredited)

Pat Flaherty

Watchman (uncredited)

Eddie Hart

Police Detective (unconfirmed) (uncredited)

Grace Hayle

Fat Lady at Auction (uncredited)

Tom Herbert

Reporter (uncredited)

Milton Kibbee

Reporter (uncredited)

Keye Luke

Taki - Casino Pageboy (uncredited)

Alphonse Martell

Roulette Croupier (uncredited)

Bert Moorhouse

Casino Patron (uncredited)

Miki Morita

Japanese Casino Waiter (uncredited)

Pinky Parker

Photographer (uncredited)

Frank Reicher

Assistant Coroner (uncredited)

Dick Rush

Police Detective (uncredited)