New Year's Eve. A group of friends, all around 18 years old, get together for a party. Ties of love and friendship are formed and broken off. At the frontier between carelessness and seriousness, their true natures come to light.

An unlikely friendship develops between a hitman and a suicidal guy who have both checked into the same hotel for different reasons.

When 12-year-old Tonin's teacher announces that he is looking for volunteers to house one of several orphan African refugees for a month during their visit to Paris, the exuberent, well-meaning youth immediately offers his own abode. His classmates cheer and he feels happy until he broaches the subject with his parents. Daniel, the boy's father is delighted by his son's humanitarianism, but still says no. Not wanting to lose face at school, Tonin decides to take the visitor anyway and just keep him hidden for the next few weeks. This family-oriented French comedy follows his efforts to keep his new African guest, Moussa, a secret.

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