Milchmord

Hubert and Girwidz find the body of the elderly art patron Irmgard Kühne next to her car. Pathologist Fuchs suspects food poisoning caused by contaminated milk. But Irmgard Kühne had only drunk milk from her own goat, which lives on the farm of dairy farmer Johann Auzinger. It has since been determined that colchicine, the toxin found in autumn crocus, was the cause of death.

Hubert and Girwidz therefore suspect that the milk was poisoned after it was milked. Initially, Auzinger's father, Alfons, comes under suspicion; many years ago, he had been engaged to Mrs. Kühne but was subsequently rejected.

However, Mrs. Kühne's daughter Tanja—a herbalist who lives with her husband Frank in a dilapidated building next to Mrs. Kühne's villa—would also have a motive. The couple feared they would end up on the street, as the elderly lady was about to move into a luxury retirement home in Munich. But the Wiesers have an alibi for the time of the alleged crime.

The investigators come up with a new line of inquiry: What if the goat itself was poisoned and the poison got into the milk? Hubert and Girwidz take the goat to the police station. Riedl is supposed to watch it until it passes a stool.