A young French teenage girl after moving to a new city falls in love with a boy and is thinking of having sex with him because her girlfriends have already done it.

François Toledo, married businessman and father, falls head-over-heels in love with Janine, a work colleague. However, he is soon found out: after three dates, he strangles some prostitutes, when, the victim of blackmail, he becomes dishonored. He is taken to court, and sentenced to be killed by a guillotine.

Jean-Louis, a garage worker and womanizer, asks his friend and boss to reverse roles for a while, to make his brother, who has just arrived from South America, believe he's not only the boss, but also his wife's husband.

A French man's monotonous routine is broken when he begins to suspect that he is living the same day again and again.

When an American tourist is murdered in the south of France, the police must investigate. In this movie, the police inspector re-creates the girl's journeys through France until the murder is solved. Suspicions are narrowed down to four possible perpetrators early on, and flashbacks illuminate the roles each one played in the girl's vacation.