Watch Bonjour Tristesse (2025) : Full Movies At the height of summer, 18-year-old Cécile (Lily McInerny) is relaxing by the French seaside with her father (Claes Bang) and falling in love with her new boyfriend. The arrival of her late mother’s enigmatic friend (Chloë Sevigny) turns her world upside down. A modern take on Françoise Sagan’s unforgettable coming-of-age novel. A Toronto International Film Festival premiere.