While jogging together, Christina stumbles upon the body of asset manager Peter Münch. How he died is initially unclear, as there is a strange wound on his neck. The question of where the victim was before his death is also not easy to answer.

While his widow Erika Münch believes he was at the community center attending a support group for overweight people, the "Festen Freunde" (Close Friends) – as the group is called – claim that Peter Münch had not attended their meetings for weeks. It also quickly becomes clear that the deceased had no real friends among the members and that there is generally a tense atmosphere within the group. When it emerges that the group's initiator, Frank Leibnitz, has also stolen money from the group's joint fund, the situation threatens to escalate completely.

Girwidz, however, is only half paying attention; he has completely different problems: in a few days, he has his MPU (medical-psychological assessment) and hopes to finally get his driver's license back. He hasn't told his colleagues yet – in the unlikely event that he fails, he doesn't want to embarrass himself. However, when he learns during the investigation at the community center that special courses are offered to prepare for the MPU, he panics and wonders if he is really well enough prepared. Because time is running out, Yazid is supposed to fix it with a crash course.

Meanwhile, Hubert and Christina discover that the deceased had incurred the wrath of some clients in his role as asset manager, most notably Frank Leibnitz from the "Festen Freunde" (Close Friends) ...

Far away from civilization, Riedl roams through the wilderness. He is on the trail of poachers who have been hunting cormorants for some time. Suddenly, a retriever shoots out of a conifer tree, carrying a shoe in its mouth. Riedel approaches the fir tree, pushes the branches aside, and discovers the body of a man with a bullet hole between his eyes.The investigators find nothing to indicate the man's identity. The only clue to the perpetrator is long, white hair in the branches of the fir tree. Since the area is heavily hunted, Girwidz thinks it could be a hunting accident. No one but a fish farmer would benefit from the death of a cormorant. That's where they should start.Shortly afterwards, it turns out that the dead man is a violist who played in a string quartet at a wedding the night before. It appears that he was shot on his way home. The three local fish farmers are summoned for questioning the next morning. A rough-looking fellow with his gray hair tied back in a ponytail immediately catches the investigators' eye. He vehemently denies the accusations.In the course of the investigation, it emerges that the deceased was having an affair with the only woman in the string quartet and that her boyfriend has a hunting license. But his alibi is watertight...