When Astrid, a professional therapist who is struggling to find meaningful friendships, starts having an affair with her patient Céline's husband, it creates additional strain on an already difficult relationship with her son, David, who disapproves of his mother's taste in men. Meanwhile, Céline, who is a retired prostitute content with living a domesticated life, befriends David when he tries to run away from home by booking a flight through her travel agency.