Barely has Kalle become the school reporter when one scandal chases another: Not only does the math teacher of the four friends lose his swim trunks while jumping off the three-meter diving board, but a car has also been stolen from the teacher's parking lot. And it belongs to a police officer! Kalle is convinced: Everything points to a teacher as the culprit. So the four friends start investigating and stumble upon a strange clue. A new case for the four friends.