Three siblings gather to celebrate the birthday of their father, on the island of Ré. This is Adele, the elder of the two sisters, who had the idea to organize this surprise. Alice and Antoine adhere immediately. Arnaud, the eldest, is sidelined because of his bad temper. But then they make their way to the family home, an incident occurs. A black cat crossing the road when the father arrived by motorcycle. It is the accident.

Venus fêter l'anniversaire de leur père sur l'Ile de Ré, quatre frères et sœurs verront leurs préparatifs voler en éclat lorsque le patriarche trouvera la mort à la suite d'un malaise cardiaque. Pendant tout un week-end, la fratrie en deuil tentera de maintenir le lien qui l'unit.