Detective wanted! When you see things that others don't. If you like to track down secrets that others don't even feel, come to the tree house today during the big break. Olli has been working on his detective career for some time. But as everyone knows who wants to become a Sherlock Holmes, you also need a Watson. And who would be better suited for this than the reader himself? During the interview it quickly becomes clear that Olli and the reader are on the same wavelength, but they don't have much time to get used to each other, because they hear someone shout: "Hey, stop the thief!" And they are already in the middle of it , in their first case ...

Interactive puzzle fun that speaks to the reader directly and takes you into a world full of puzzles, hidden objects, word and number games.