Free-lance undercover agent Coplan receives a phone call from an old girlfriend in Turkey. The panic-stricken woman gives sketchy details of a plot that threatens world security. When Coplan arrives, he is told the woman has been killed, and the trail of the murderer leads to her mad-scientist brother.
| Directing | Yves Boisset | Director |
| Writing | Claude Veillot | Dialogue |
| Production | Robert de Nesle | Producer |
| Camera | Alain Derobe | Director of Photography |
| Camera | Pierre Lhomme | Director of Photography |
| Writing | Yves Boisset | Scenario Writer |
| Editing | Gilbert Kikoïne | Editor |
| Sound | Jean-Claude Pelletier | Original Music Composer |
| Writing | Jean Libert | Novel |
| Editing | Claude Gros | Editor |
| Writing | Claude Veillot | Scenario Writer |
