In the beautiful family home, at the end of the summer, Monique celebrates her 70th birthday, surrounded by her 4 children, all of whom have come for the occasion. There is Jean-Pierre, the elder, who took on the role of head of the family after the death of his father; Juliette, pregnant with her first child at 40 and who still dreams of becoming a writer; Margaux, the family’s radical artist, and Mathieu, 30, anxious to seduce pretty Sarah. Later, one day, one of them will make a life-changing decision …