Much touted at the time as the first of Louis (The March of Time) De Rochemont's documentary thrillers, made with the full cooperation of the FBI. It still works well enough, even though the breathless revelation of the hardware of counterespionage (hidden cameras, two-way mirrors, microfilm, etc) has become slightly old hat. More fascinating, given J Edgar Hoover's personal interest in the project - he even appears on screen to introduce it - is the way the Nazi spy ring, foiled before they can get away with the secrets of the atom bomb, could be read as dirty Commies. The low-key performances contribute effectively to the sense of actuality, despite clumsy mistakes like having Signe Hasso masquerade none too convincingly in drag as the mysterious spymaster.
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