Paul Lukas as Philo Vance

Alison Skipworth as Priscilla Kinkaid Llewellyn

Donald Cook as Lynn Llewellyn

Rosalind Russell as Doris Reed

Arthur Byron as Richard Kinkaid

Ted Healy as Police Sergeant Ernest Heath

Eric Blore as Currie

Isabel Jewell as Amelia Llewellyn

Louise Fazenda as Becky

Purnell Pratt as District Attorney John Markham (as Purnell B. Pratt)

Leslie Fenton as Dr. Kane

Louise Henry as Virginia Llewellyn

Leo G. Carroll as Smith (as Leo Carroll)

Charles Sellon as Dr. Doremus

Ernie Adams as Husband of Fat Lady at Auction (uncredited)

Brooks Benedict as Casino Patron (uncredited)

Edna Bennett as Nurse to Lynn (uncredited)

Sidney Bracey as Waiter (unconfirmed) (uncredited)

Wallis Clark as Dr. Elton (uncredited)

William Demarest as Auctioneer (uncredited)

Jay Eaton as Auction Floorman (uncredited)

Lillian Elliott as Mrs. Marting (uncredited)

Pat Flaherty as Watchman (uncredited)

Eddie Hart as Police Detective (unconfirmed) (uncredited)

Grace Hayle as Fat Lady at Auction (uncredited)

Tom Herbert as Reporter (uncredited)

Milton Kibbee as Reporter (uncredited)

Keye Luke as Taki - Casino Pageboy (uncredited)

Alphonse Martell as Roulette Croupier (uncredited)

Bert Moorhouse as Casino Patron (uncredited)

Miki Morita as Japanese Casino Waiter (uncredited)

Pinky Parker as Photographer (uncredited)

Frank Reicher as Assistant Coroner (uncredited)

Dick Rush as Police Detective (uncredited)