A security leak is found at a Southern California atomic plant. The authorities stand in fear that the information leaked would go to a hostile nation. To investigate the case more efficiently, Dan O'Hara, an FBI agent, and Philip Grayson, a Scotland Yard sleuth, join forces. Will they manage to stop the spy ring from achieving their aim?
Louis Hayward
as Philip 'Scotty' Grayson
Dennis O'Keefe
as Daniel F. O'Hara
Louise Allbritton
as Dr. Anastasia 'Toni' Neva
Carl Esmond
as Dr. Ritter von Stolb
Onslow Stevens
as Igor Braun
Raymond Burr
as Krebs
Art Baker
as Dr. Frederick Townsend
Lowell Gilmore
as Dr. William Forrest
Philip Van Zandt
as Anton Radchek
Charles Evans
as Dr. Homer Allen
Frank Ferguson
as Carl Bemish
Reed Hadley
as Narrator (voice)
