Que La Bete Meure

Charles Thenier's (Michel Duchaussoy) only son is killed in a hit and run accident. Bent on revenge, the anguished Charles resolves to track down and kill the driver. During the course of his quest, he meets and starts an affair with Helène (Caroline Cellier) - whose brother-in-law Paul (Jean Yanne) may be the man Charles is looking for.

Complications accumulate when the boorish Paul's adolescent son (Marc Di Napoli), who detests his father, attaches himself to Charles.