A murder at Stuttgart Airport leads Bienzle to the Allgäu this time. The murder victim, the young Sicilian Luigi Ricci, spent some time there with his brother Giovanni, who runs a thriving pizzeria in Wagenbrunn. What Luigi wanted in Wagenbrunn initially remained hidden from Bienzle. However, certain circumstantial evidence indicates that he was involved with the Mafia. However, Bienzle is also interested in Marlene Mergenthaler. It can be proven that Luigi's girlfriend in Wagenbrunn was at the scene of the crime, left him in a hurry immediately after the murder and shortly afterwards caused a serious car accident. When Bienzle learns that the Italian wanted to leave her, he becomes increasingly suspicious of the girl's behavior. Marlene's jealous ex-boyfriend Simon knew nothing about the upcoming separation.
Did he shoot his rival? But as it turns out, Marlene's father was not at all on the side of Luigi either. Bienzle soon comes to the conclusion that the Mergenthaler family clan has at least as mafia-like structures as the Ricci family. However, their involvement with the mafia can no longer be denied. Just now, when Bienzle is investigating in the Allgäu, Hannelore is doing a wellness cure nearby. Now Bienzle is faced with the question of whether he should visit her there or not. Does she possibly want to be left alone or will she end up angry if he doesn't show up to her? This question is at least as difficult to solve for Bienzle as the murder case.