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...

Hubert and Girwidz find little Lina completely alone and unsupervised outside a kindergarten, whereupon Hubert gains access to the kindergarten. In the kindergarten director's office, he discovers the body of teacher Simone Hackl. Apparently, a burglar gained access and broke open the cash box.
Since the burglar must have been seen by kindergarten child Lina, Hubert suspects that the break-in was only staged to distract from another motive. The decision to hold an extraordinary parents' council meeting seems to prove him right, as the parents have demanded the immediate dismissal of the dead teacher.
Hubert and Girwidz grill the parents and find out that most of them did not agree with the victim's teaching methods. What's more, the chair of the parents' council, Michaela Schmidhofer, accuses the victim of assault. The victim is said to have given her "tasty" meatballs to her vegan daughter to eat.
Hubert and Girwidz ask themselves whether this unusual act of bodily harm is sufficient to commit murder. Despite their unconventional investigation methods, it is kindergarten child Lina who provides the decisive clue.