Fernand Naudin (Lino Ventura) is an ex-gangster, who now deals in agricultural machinery and lives in Montauban. His modest, quiet life is disrupted when his childhood friend, nicknamed "The Mexican", who has become the Boss of a gangster organisation, summons him to his death bed. He has to take care of his friend's "business" and of his daughter, Patricia, who only thinks about having fun and has never been kept in a college for more than six months. Mister Folace (Francis Blanche) watches after "The Mexican"'s camp followers with a benevolent neutrality, as he don't feel really concerned by the upcoming quarrel about the succession, like Jean (Robert Dalban), butler and former housebreaker. Fernand must face the Volfoni brothers, Raoul (Bernard Blier) and Paul (Jean Lefebvre), who have the lucrative underground business whose succession is about on sight...
Question: What is the relationship between Fernand Naudin and "The Mexican"?, Answer: childhood friends Question: What is "The Mexican" the Boss of?, Answer: gangster organization Question: What does "The Mexican" want Fernand to do for him?, Answer: take care of his "business"