An insidious murder that particularly hits Chief Inspector Stefan Deininger to the core. He wasn't completely indifferent to his pretty colleague Kathi, who was lying there in front of him, badly beaten up. The first thing the homicide team had to realize was that they actually knew very little about the always so friendly and cheerful colleague. Solving the case puts Palu's successor, as well as the team he finds together, before their first joint test. It shows whether the newcomer really arrives in Saarland and whether there is creative cooperation with the rest of the department. "Assistant" Stefan Deininger, previously in the shadow of Max Palu, and part-time secretary Ms. Braun are already familiar to the audience of Saarbrücken "crime scenes".
Now it also gets to know Horst Jordan, the head of forensics, his colleague Ben and the coroner Dr. Rhea Sing. They are all confronted with a new boss that nobody expected. A blond, curly-haired young guy from Bavaria applied for the vacant post after Palü's departure. Franz Kappl comes from Traunstein to Saarbrücken with a small household item and a lot of enthusiasm and bursts into the middle of a birthday party. Stefan Deininger turns 38, and everyone in the department assumes that he will be Palu's successor. The noise is programmed, bullying is the order of the day, but solving the criminal case requires everyone to work together. The inspectors have their own methods of dealing with the crime.
Convinced that there is no such thing as a perfect murder, Franz Kappl relies on forensic science and psychology. Stefan Deininger lets the extensive network of relationships in the small Saarland work for him: Almost everyone knows everyone or has someone who knows someone, and almost nothing stays secret. In their first joint investigation, the murder of Kathi Schaller, the two can prove which method makes the most sense and when. The suspects include the ailing musician Charlie Wax, the jeweler couple Bader, who rather seek pity, and two brutal Frenchmen. But the customs colleagues are also putting the investigators' patience to the test. And the innocent murder victim, the beautiful Kathi Schaller, suddenly appears in a completely different light.