Cast
I. Stanford Jolley
Rolf Brot, alias Ralph Brett
Virginia Brissac
Mrs. Marsh
Janet Shaw
Gloria Bayne
Charles Sherlock
Sgt. McGraw (uncredited)
Charles Wagenheim
Rausch (uncredited)
Sidney Toler
Charlie Chan
Ben Carter
Ben Carter
Reid Kilpatrick
Mr. Chester, program announcer
Emmett Vogan
Mr. Hamilton
Mantan Moreland
Birmingham Brown, Chauffeur
Jack Norton
Willie Rand
Victoria Faust
Hulda Swenson / Janet Carter
Crane Whitley
Henchman Cooper
Charles Jordan
Nelson (uncredited)
Kenner G. Kemp
Police Radio Expert (uncredited)
Milton Kibbee
Herbert Sinclair (uncredited)
Benson Fong
Tommy Chan
Robert Homans
Capt. Flynn
Leonard Mudie
Horace Karloss, Horace Karlos (uncredited)
Kernan Cripps
Detective (uncredited)
Frank Mayo
Det. Hodge (uncredited)