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Vlassov is a Soviet spy who defects in France. He is whisked to the U.S, where Allan Davies takes over the case. After polygraph tests and cross-examinations, Vlassov names several Western European agents who are also spying for the Soviets. Davies wants to take the listed agents into custody; meanwhile, those on the list start dying under mysterious circumstances.
Featured Crew
| Henri Verneuil | Director |
| Pierre Nord | Novel |
| Gilles Perrault | Screenplay |
| Henri Verneuil | Screenplay |
| Henri Verneuil | Producer |
| Ennio Morricone | Original Music Composer |
| Claude Renoir | Director of Photography |
| Pierre Gillette | Editor |
| Jacques Saulnier | Production Design |
| Hélène Nourry | Costume Design |