Chinese sleuth Charlie Chan discovers a scheme for the theft of government radar plans while investigating several murders.

Sidney Toleras Charlie Chan
Benson Fongas Tommy Chan
Mantan Morelandas Birmingham Brown, Chauffeur
Robert Homansas Capt. Flynn
I. Stanford Jolleyas Rolf Brot, alias Ralph Brett
Virginia Brissacas Mrs. Marsh
Jack Nortonas Willie Rand
Janet Shawas Gloria Bayne
Ben Carteras Ben Carter
Victoria Faustas Hulda Swenson / Janet Carter