Lorsque l'enfant paraît: After World War II, the orderly life of a deputy secretary of state for family affairs, who had succeeded in closing brothels and increasing penalties for abortion offenses, is turned upside down when he learns on the same day that his wife is expecting a child and that his son has impregnated his secretary! This is only the beginning of a series of unexpected events that will shake up the foundations of this bourgeois family...