Investigate with TKKG in a new, exciting case that you do not know from the radio plays or books! In this one, an increasing number of students no longer feel safe at boarding school. What is the truth behind the rumors of blackmail and intimidation at the school? Tim, Karl, Klößchen and Gaby investigate and not only have to deal with a neglected ex-teacher and demonstrating animal rights activists, but also encounter self-appointed "guardian angels" who want to ensure safety in the schoolyard. The good reputation of the school is at stake! Help TKKG uncover the evil machinations and put a stop to the culprits!