A guy named Malo Monestier is 15 years old. He has to move with his parents and younger sister Jeanne from noisy Paris to a godforsaken backwater. Now they will all live in a spacious house of their own, overlooking the forest. But something is wrong with this house. The house under the pines seems to be following Malo. Jeanne screams at night and talks about a new friend named Pauline. But neither in the House under the pines, nor for many kilometers around there is no Polina, they are alone here. Then Malo decides to find out what's going on. And he digs up a terrible story that 30 years ago a girl named... disappeared without a trace in this very house. Pauline! What if Pauline's ghost asks for help? What if she didn't just get lost in the woods?