Two students, Antoine, the son of a Southern pedal boat renter, and Marie, the daughter of a Paris railway executive, have got engaged in secret. They are now willing to clarify the situation and decide that their parents should get to know one another before they marry. The summer holidays seem to be the ideal opportunity for that and Antoine invites Marie's family to come and stay for a while at their home in the South. Unfortunately, things do not go too well between the stark Malhouin and the extroverted Lartigue and the relationships soon come close to the breaking point. As for the lovebirds, they are not spared as jealousy gets in their way...