100,000 bees are to move into the boarding school garden, and beehives have also recently been installed on the roof of the town hall in this city of millions. When they suddenly disappear, TKKG search for solid evidence. But who could have a motive to harm the useful insects? When the mayor also receives a threatening letter, the detectives realize that this case is bigger than they first thought.

TKKG - that's Tim, Karl, Klößchen and Gaby. The four friends bravely solve every case and embark on exciting adventures. Of course, Oskar the dog is not to be missed.