Nelly has just lost her grandmother and is helping her parents clean out her mother’s childhood home. She explores the house and the surrounding woods. One day she meets a girl her same age building a treehouse.
After her grandmother dies, Nelly (Joséphine Sanz) is taken to her mother’s childhood home. While her parents go about cleaning out the house, Nelly explores the surrounding woods. She encounters Marion (Gabrielle Sanz), a girl exactly Nelly’s age and to whom she bears a striking resemblance. The pair become fast friends, constructing a hut together, sharing lunches, and talking over the life transitions both are in the midst of. (Marion is only days away from going to hospital for an operation.) Incrementally, the girls’ eerie similarities yield revelations that merge events of the past with those of the present.