S1, E2: Bringing two drunk and rowdy youths to order at the S-Bahn station sounds like a routine job for Hubert and Staller. But when one of the hooligans can't keep his stomach contents down and Staller has to go to the public toilet to clean his uniform, he suddenly finds himself standing in a pool of blood. Murder victim Markus Botzek is still tied up and countless knife wounds suggest that the perpetrator wanted to see his victim suffer. The fact that the dead man has just served an eight-year sentence for rape and has the words "Never again!" emblazoned on his forehead leads Hubert and Staller to suspect that someone deemed the sentence too lenient and took the law into his own hands! While police master Riedl diligently evaluates the numerous surveillance videos from the train station, Hubert and Staller deliver the death message to the victim's father Robert Botzek, with whom the son had been living after his return. Hubert and Staller cannot escape the fact that the father already seemed to know about the son's death, but they blame it on local reporter Barbara Hansen, who is not usually very discreet with confidential information. Markus Botzek's ex-wife Sandra is far more shocked by the death than his father. She has a new boyfriend by now and has barely any contact with Markus but still lives next door to his father. The somewhat unclear family relations in the Botzek house, however, seem negligible when Hubert and Staller look at their colleague Riedl's video evaluations: one of the tapes clearly shows that a certain Hermann Killer was at the station at the time of the crime. And Hermann Killer not only has a promising name, he is also the father of one of the rape victims.