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

The Cordier fight in family against the crime: the father is police captain, the son, investigating judge and the girl, a journalist.

A journalist wrongly accused of murder enlists the help of a femme fatale to track down the real killer.

Pierre has four months left to live if he does not find a new liver. His only hope is a transplant from his brother, Paul. But Pierre hates Paul and has refused to see him for the past ten years. They are different in every aspect : their way of life, their tastes. Nevertheless, Marie, Pierre's fiancee, is determined to reconcile the two men. A love-hate relationship develops, disrupting the trio, recomposing the couples and even going so far as to change their personalities. After a few too many drinks and a bit of fooling around, the settling of scores between the two brothers will come to a surprising end.

A young woman finds an isolated inn is the base of a gang of smugglers

Gaspard is a brilliant pupil who makes a clean sweep of all the prizes every year. He despises his family, and do not want to remain a crude peasant like them. Two businessmen, Mister Fereor and Mister Frolichein, want him to work in their factories. The former wins the contest. Gaspard is a young Turk who wants to make his way of life at any cost. He steals ideas from other young men and becomes an occasional informer. He wins his boss over and, as this tycoon has no son, he is adopted by him even though his biological parents are still alive. But unfair competition threatens Fereor's business and Gaspard is forced to marry Frolichein's daughter, Mina.