A large international cast takes part in this comedy in which the stories of numerous individuals whose cars are stalled in a massive Roman traffic jam are told.
When the boss' unlucky daughter is missing in South America, Campana is sent to watch the boss' most unlucky employee who is sent as a private detective in hopes he can duplicate the daughter's mistakes.
Three days in the lives of six friends who are nearly 30 years old, live in Grenoble, and have a rock band called the "Why Notes?". They're to play in Paris at Charles's school reunion. In getting to Paris and back, the characters interact with Aimee's ex-husband and her abrasive, cruel ex-mentor, Louise's would-be lover who turns out to have a husband, Mickey's long-time lover and her children, Bertrand's Germanic wife and their children who speak no French, and Frederic's distant mother. The band also meets Clara, a mercurial free spirit who beguiles Bertrand, then Mickey, then takes up with someone else in the band.
A lawyer hires a call girl after learning his wife has invited her lover to move in; the husband and wife separate and the two new couples live side-by-side without issue - until an ex-boyfriend shows up and things start to go wrong.
Two French policemen, one investigating a grisly murder at a remote mountain college, the other working on the desecration of a young girl's grave by skinheads, are brought together by the clues from their respective cases. Soon after they start working together, more murders are committed, and the pair begin to discover just what dark secrets are behind the killings.
A shaman from the South American rain forest visits France for a public relations campaign. In a hotel's elevator in Paris he meets a French good-for-nothing named Perrin he's fascinated with. He follows Perrin to his flat and although Perrin is not very enthusiastic about so much interest in his person, he lets the shaman spend the night in his flat. After an official meeting on the next day being part of the PR campaign the shaman suffers from a heart attack. Hardly being able to speak and laying in a hospital bed he demands to see Perrin. The latter is not very interested in meeting the shaman again. However it looks like it is to late for animosities as the shaman and Perrin seem to be tied mentally somehow since they've met in the elevator.