Actually, the police officers Melanie Sommer (Anna Brüggemann) and Frank Schneider were only supposed to ensure peace and quiet at a loud party in a residential building. But a little later, the young detective is injured and found traumatized in the garden of the house. Her colleague was beaten up so brutally that any help comes too late for him. The police murder caused a stir not only in the headquarters and in the press. Frank Schneider's partner Stefan Pohl (Max Simonischek) can't believe the loss either: the two met on duty. The head of department Bernd Schäfer (Götz Schubert) did not like the relationship. He also doesn't like the fact that the homicide squad is now checking their own people...