"On the heels of her beloved grandmother's death, eight-year-old Nelly (Joséphine Sanz) ventures with her parents to her mother's childhood home to prepare it for sale. As Nelly wanders the home and its grounds, she encounters an enigmatic young girl named Marion (Gabrielle Sanz), who looks uncannily similar to her, determined to build a treehouse in the idyllic forest nearby. Céline Sciamma writes and directs the fantasy drama co-starring Nina Meurisse and Stéphane Varupenne."