In the Georgengarten, an unknown dead woman leans against a tree; arranged by the murderer as if she is sleeping. What does this woman have to do with a murder committed nearly twenty years ago? Before Charlotte Wiegand's team can uncover the mystery, another murder occurs, and a young witness finds herself in mortal danger. At the same time, Rüdiger Bergheim must deal with a group of students who are tyrannizing their peers using mafia-like methods. Ultimately, Wiegand and Bergheim discover what all the involved parties have in common: they were participants in a wedding party - and one of them is a murderer.