The Berlin taxi entrepreneur Herbert Klemke is found dead in his office. The investigations by commissioners Till Ritter (Dominic Raacke) and Felix Stark (Boris Aljinovic) quickly reveal that various people had a fight with Klemke on the night of the crime: his former employee Bülent Delikara (Oktay Özdemir), for example, that of his ex-boss get a bigger amount of money.
Or Ziska Zuckowski (Alwara Höfels): With her brother Pit (Christian Blümel), she continues to run her parents' delicatessen, which is running more or less poorly, and could no longer afford the constantly increasing additional costs of her landlord Klemke. She has a motive – just like Klemke's daughter Dagmar (Nicolette Krebitz), who wanted to use her father's money to open a diving school in a luxury Australian resort. Klemke's secretary Edith Welziehn (Renate Krößner) had been loyal to her boss for over 40 years and is now deeply shocked by the human loss.
During further investigations, the inspectors discover that Klemke's bank advisor Christa Meinecke (Tatjana Blacher) has carried out money transactions on her own - including via Klemke's accounts. Ms Meinecke has known both Ziska Zuckowski and Dagmar Klemke for years and is aware of their financial needs and concerns. And Klemke, in turn, found out what Frau Meinecke was doing behind his back and wanted to confront her on the night of the crime.
There are many suspects, but all leads come to nothing, because all possible perpetrators have a watertight alibi. Nevertheless, Ritter and Stark are absolutely certain: They must look for the murderer in Klemke's immediate vicinity.