After a novice nun learns of the sudden death of her parents, she leaves the convent to manage the family business and look after her teenage sister. Both of them fall prey to a womanizing mechanic with psychopathic tendencies.

A brave and talkative wine merchant, Eugène Barbentin drives his son Pierrot out of the family home, because he has given birth to his girlfriend. His wife then reveals to him that he is not Pierrot's father and she flees with her lover. Abandoned, Eugene will be saved by his mother who will restore the situation with energy and determination.