Chinese sleuth Charlie Chan discovers a scheme for the theft of government radar plans while investigating several murders.
Charlie Chan
Tommy Chan
Birmingham Brown, Chauffeur
Capt. Flynn
Rolf Brot, alias Ralph Brett
Mrs. Marsh
Willie Rand
Gloria Bayne
Ben Carter
Hulda Swenson / Janet Carter
Diane Hall
Horace Karloss
Mr. Chester, program announcer
Mr. Hamilton
Henchman Cooper
Detective (uncredited)
Nelson (uncredited)
Police Radio Expert (uncredited)
Herbert Sinclair (uncredited)
Det. Hodge (uncredited)
Horace Karlos (uncredited)
Chemist (uncredited)
Sgt. McGraw (uncredited)
Rausch (uncredited)
