Nuclear physicist Alvah Jesper is recruited by the U.S. Office of Strategic Services to become a reluctant undercover agent, traveling to Switzerland to meet with a fellow scientist regarding information on Germany's plans to construct an atomic bomb. After this colleague is assassinated, Jesper must sneak into Italy via the underground resistance, to contact another scientist. While there, Jesper falls in love with resistance fighter Gina, and the two must battle shootouts, double crosses, and narrow escapes to smuggle the scientist out of Italy.

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