When the Vos family arrives in an amusement park for an annual weekend together, eleven-year-old Teun (Levi Otto) discovers that his recently deceased grandfather, whom he misses very much, has left one last puzzle behind. Although most adults think that this is nonsense, Teun goes on an exciting expedition through the amusement park with his special aunt Ada (Raymonde de Kuyper) to find out what his grandfather has hidden from him. Teun finds out that it's about his grandfather's precious fairytale book. But Teun and Ada are not the only ones who are after the book, a mysterious figure bothers them the whole time.. Will they manage to find the book in time and thus keep the Vos family together?
