Fernand (Lino Ventura) is the owner of a small company that makes tractors. When he gets involved with gangster his gambling debts mount, he is called on to do a favor for the mob. Fernand is asked to look after the daughter of a dying friend. When a longtime mobster heavy (Bernard Blier) takes exception to Fernand for being an outsider, they come after Fernand who is equal to the task. Fernand defends himself in a series of comical killings from the onslaught of the mob.