William Powell
Philo Vance
Florence Eldridge
Sibella Greene
Ullrich Haupt
Dr. Von Blon
Jean Arthur
Ada Greene
Eugene Pallette
Sergeant Heath
E.H. Calvert
John F. X. Markham
Gertrude Norman
Mrs. Tobias Greene
L
Lowell Drew
Chester Greene
Morgan Farley
Rex Greene
Brandon Hurst
Sproot
A
Augusta Burmeister
Mrs. Mannheim
Marcia Harris
Hemming
V
Veda Buckland
Nurse (uncredited)
S
Shep Camp
Medical Examiner (uncredited)
C
Charles E. Evans
Lawyer Canon (uncredited)
H
Helena Phillips Evans
Miss O'Brien (uncredited)
M
Mildred Golden
Barton (uncredited)
Harry Strang
Policeman (uncredited)