After socialite Lynn Llewellyn receives an anonymous threat, he is poisoned at his uncle's casino, and although he recovers, his wife is murdered by the same killer.

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)