This fast-paced mystery is in part based on a novel by Yves Ellena and is at least equally based on the 1943 classic Le Corbeau, which in 1951 was produced in English by Otto Preminger as The Thirteenth Letter. In this movie, someone is using a pirate radio broadcast to dish the dirt on the lives of the elite of a small French town.
| Writing | Yves Ellena | Novel |
| Writing | Yves Boisset | Dialogue |
| Writing | Yves Boisset | Adaptation |
| Directing | Yves Boisset | Director |
| Writing | Alain Scoff | Scenario Writer |
| Writing | Alain Scoff | Adaptation |
| Camera | Jacques Loiseleux | Director of Photography |
| Editing | Laurence Leininger | Editor |