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.
| Release Date | April 7, 1973 | |
|---|---|---|
| Status | Released | |
| Original Title | Le Serpent | |
| Runtime | 1h 53min | |
| Budget | — | |
| Revenue | — | |
| Language | French, English, German | |
| Original Language | French | |
| Production Countries | Germany, France, Italy | |
| Production Companies | Rialto FilmLes Films La BoétieEuro International Films | |