Summer holidays in the forest - seven-year-old Lene from Mecklenburg has no desire for that at all. Nothing but trees, mountains and children whose language she finds strange: Bavarian! But then there is the story of Wald-Peter, who is said to be trapped in a "grotto of sleeping souls", or that of the mysterious Wald-Ursel, whose soul lives on in the forest. Lene meets the forest Obelix and a cool young ranger, learns about Bavarian rap and the best hiding places in the forest.