No one knows better than ... than Marc-Uwe Kling's little know-it-all! Tina and Theo Theufel are stuck with parents who don’t have a dog but constantly want to eat beets. Moreover, they always think they know better. Well, the parents do. The kids do too. After all, the apple doesn't fall far from the tree. But at least Theo and Tina admit that they are know-it-alls. Mom and Dad deny it. This is, of course, utterly ridiculous. Recently, the Theufels moved into an old house with an attic full of adventures. Although playing in the attic is frowned upon, Tina and Theo love nothing more than that. Additionally, the kids make a strange discovery in the attic: in a box of books lives a little creature with a big mouth. A real know-it-all who claims to be visible only to its kind! A funny, captivating story from the audiobook universe of Marc-Uwe Kling.