Antoine Mouret, an authoritarian restaurateur, is the head of a large family where, for reasons of interest, people only marry cousins. But some have other plans, Marcus especially when he meets a passing circus girl.
An untiring lady social worker, Émilienne, has as one of her charges a stableman who was wounded by his mistress. Unfortunately, Émilienne's young sister who was helping her at work decides to go away with the stableman.
A child is rejected by his father and sister when his mother dies giving birth to him. The family is falling apart; the father takes to drinking, the child is placed with a nurse. However, the little girl will take the initiative to bring the child back to the family home which she decides to take care of, thus encouraging the father to change his behavior.
Monsieur Benoit's existence is transformed when his dour wife suddenly thinks in a bout of folly that she will become a chanteuse and her husband the impresario.
A famous writer takes in a young amnesiac who, thanks to his care, remembers having tried to kill her unfaithful lover. He will know how to console her and share with her a new happiness.
Paris, France. Commissaire Wens is put in charge of the investigation into the murder of one of six friends who, in the past, made a very profitable promise.
