"Who was guilty of one of the most baffling crimes ever committed?"
Philo Vance investigates when a murderer preys upon members of a wealthy family on New York's Upper East Side.
Philo Vance

Sibella Greene

Dr. Von Blon

Ada Greene

Sergeant Heath

John F. X. Markham

Mrs. Tobias Greene

Chester Greene
Rex Greene

Sproot

Mrs. Mannheim
Hemming

Nurse (uncredited)
Medical Examiner (uncredited)
Lawyer Canon (uncredited)
Miss O'Brien (uncredited)
Barton (uncredited)
Policeman (uncredited)
