Lucky, owner of the Les Naturistes nightclub, is organizing bets for the Longchamp races. Max, the tipster, is shot by Bramati, Luky's ex-partner. The Judicial Police investigate and must deal with the case tactfully to find the killer

In the elegant nightclub of Corsican Luciano, known as Luky, "Les Naturistes", we play big sums at the Longchamp races. Luky, ballet master, does not just "welcome" the new dancers, he collects the stakes that are entrusted to him and personally plays the horses recommended to him by Max, a former convict. But Bramati, Luky's ex-partner, does not forgive Max for overtaking him and has him shot.