Gesa Jansen, a customer service representative at an extramarital affairs agency, was pushed out of an office window. The police suspect that she had trouble with a dissatisfied client. Jochen Franke, who had met with Gesa shortly before her death, wanted to complain to her because he was being blackmailed and suspected the perpetrator was someone at the agency. But the investigation takes a new turn when an attack is carried out on the agency's boss, Christine. Abysses open up...

Mick's former classmate Thomas Ambach has been murdered. Apparently, his low blood pressure pills were switched. In addition to Ambach's ex-wife Anne Nehmert, his old buddy Jochen Kranerts also comes under suspicion. The investigation is made increasingly difficult by Mick and Andreas' conflict over Isabelle, Mick's daughter and Andreas' new girlfriend. But despite all the adversity, the two finally manage to identify the real culprit...