Characters played by William Powell
Philo Vance
Characters played by Florence Eldridge
Sibella Greene
Characters played by Ullrich Haupt
Dr. Arthur Von Blon
Characters played by Jean Arthur
Ada Greene
Characters played by Eugene Pallette
Sgt. Ernest Heath
Characters played by E.H. Calvert
Dist. Atty. John F.X. Markham
Characters played by Gertrude Norman
Mrs. Tobias Greene
Characters played by Lowell Drew
Chester Greene
Characters played by Morgan Farley
Rex Greene
Characters played by Brandon Hurst
Sproot
Characters played by Augusta Burmeister
Mrs. Gertrude Mannheim
Characters played by Marcia Harris
Hemming
Characters played by Veda Buckland
Nurse
Characters played by Shep Camp
Medical Examiner
Characters played by Charles E. Evans
Lawyer Canon
Characters played by Helena Phillips Evans
Miss O'Brien - Police Nurse
Characters played by Mildred Golden
Barton
Characters played by Harry Strang
Cop in House