A thirteen-year-old French girl deals with moving to a new city and school in Paris, while at the same time her parents are getting a divorce.

A postman in a small mountain village finds a woman and her son both dead in the "grotte aux loups" (cave of wolves). He soon begins to realize than it's not natural death, and that someone in the village in behind their murder, while tragic events occur.

Pierre Renard is the blackboy of the writer George Vallier. At the time of a reception, the Italian actor Aldo Barazutti takes him for the writer and proposes to him to come to work with him in Tunisia with the development of a scenario. In fact Barazutti wants only to flee her wife to find her mistress Valerie. Misunderstandings when Vallier joined them. They must flee in the desert a jealous husband...

The series follows the adventures of lighthearted Jean-Paul Moulin, a police Commissaire, and his team as they solve crimes.