One of a handful of major Hollywood stars of the Golden Age who remained a virtual stranger to film noir, Gary Cooper plays a bachelor nuclear physicist named Alvah Jesper who is working in the United States on the Manhattan Project to build a nuclear bomb.
Recruited into the Office of Strategic Services (OSS) his mission is to make contact with a Hungarian nuclear physicist, Katerin Lodor, who has been working on the German project to make a nuclear bomb and has escaped into neutral Switzerland.
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