Jens Otten can't believe it: his fiancée Regina Scheffler was murdered. Unknown people pushed her off the balcony, vandalized her apartment and covered it with graffiti. Similar incidents of vandalism had been happening in the area recently. But now the homicide detective is investigating. While Inspector Schenk goes in search of the graffiti sprayer, his colleague Ballauf takes a close look at the private environment of the dead. And there is something wrong there. For years, her fiancé Jens Otten has been fighting a small war with his ex-wife Claudia over alimony payments. Their 15-year-old daughter Laura has hardly any contact with her father and was not on good terms with his girlfriend.
When Freddy Schenk finally finds out that the sprayer he is looking for is Laura's friend Patrick Cosca, the suspicion against the young people is confirmed. But Patrick's father, Ralf Cosca, knew the murdered woman better than he initially wanted to admit. Regina Scheffler called him three times on the night of the murder...