After finding pieces of a corpse in the animal food in the Kronberger zoo, detectivs von Bodenstein and Kirchhoff soon find out, that the dead was very popular with young people. But the parents of some of them, gourmet merchant Conradi, businessman Bock and zoo director Sander didn't like him very much. Their seems to be some common past and a tragic event when they were students. (Summary by darkman)