A desperate call alerted the Kiel police emergency number: "He's in my apartment. He just comes through the wall." But for Carmen Kessler, any help comes too late. The young woman is found brutally murdered in her apartment.

In the middle of an event at the police college, a young student freaks out and stabs her buddy. He still dies at the scene in the arms of the helpless main commissioner.

Alarm in Kiel: In an uprising in the forensic clinic, the woman killer Kai Korthals manages to escape from security custody. Korthals, who crept and killed numerous women in their homes, became Borowski's personal nightmare six years ago when he kidnapped his fiancée Frieda Jung.

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A killed infant is found in a parking lot near Kiels. Where's the mother? Did she kill her child? A found entrance volume leads Klaus Borowski and Mila Sahin to the sleepy town of Wacken in Schleswig-Holstein, which wakes up once a year when the world's largest heavy metal festival attracts 80,000 fans. The first trace leads the commissioners to Caterer Michi, who apparently took the young mother with him.

A stranger asks Thorsten Falke to meet him. He hopes, he says, that the commissioner will keep a promise that is more than 20 years old and help him out of an emergency. Since the stranger demands a commitment without revealing the further circumstances, Falke refuses. Shortly afterwards the man is pulled dead from the Elbe. It turns out he had been living under a false identity. In order to find out who the man really was, Falke and his colleague Julia Grosz have to delve deep into their own past. And with the man the two ultimately suspect, nothing seems to be as initially assumed.