Michael Lanyard / The Lone Wolf
Grace Duffy
Jamison - Lanyard's Valet
Police Inspector J.D. Crane
Marta Frisbie
John J. Murdock
Tanner
Mynher Van Groot
Steve Taylor (as Robert H. Barrat)
Managing Editor (uncredited)
Policeman Detaining Marta and Jamison (uncredited)
Sidewalk Street Cleaner (uncredited)
Policeman Searching Cellar (uncredited)
Diamond Exhibit Guest (uncredited)
Messenger (uncredited)
Shamus O'Brien (uncredited)
Guard at Diamond Exhibit (uncredited)
Police Broadcaster (uncredited)
The Waiter (uncredited)
Ava Rockling (uncredited)
Bill Slovak (uncredited)
Police Sergeant Henderson (uncredited)
Coletti (uncredited)
Tex Talbot (uncredited)
Fisher (uncredited)
Policeman (uncredited)
Paul Braud (uncredited)
Joe Brewster (uncredited)
Police Matron (uncredited)
Police Lt. Martin (uncredited)