In this Cold-War thriller Steve Roark (Gene Raymond) helps nuclear scientists in their desperate attempt to escape the ruthless Russian Communist agents who are chasing after them. Roark is a former OSS man assigned to rescue two atomic scientists from Russia and spirit them away from the Iron Curtain. Steve is shocked to discover that one of the scientists is his former lover Linda Carlsen (Sigrid Gurie). In the meantime, sexy cabaret singer-turned-spy Magda Onescu (Patricia Morison) acts as a double agent for both the Allies and the Communists, hoping to gain double profits by giving vital information to both sides.