A family of farmers has to deal with the retarded elder son. He gets everybody bored and tired of him, even his cow to whom he goes to talk to several times a day.

'Kurt' claims to be a sales rep. He also claims to be English in spite of his heavy Italian accent. Kurt is an habitual liar and a dangerous driver, at the very least. In the south of France he meets Léa, age 16. Between his increasingly strange dates with Léa, Kurt engages in a number of armed robberies, some successful, some not... The police are perplexed by a series of crimes including disappearances and a murder. They conclude that they are dealing with a madman... After he proposes, Léa breaks up with Kurt. The attempt to find a new girlfriend leads to a shooting by Kurt, now calling himself André. Léa's information identifies Kurt/André as Roberto Succo, psychiatric patient and parental murderer. The police hunt for Roberto covers three countries.