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.

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.

The notoriously unfaithful Tobias Exner has been cheating on his wife Greta, from whose money he lives, for a long time. With his anonymous acquaintance “Kitty13”, whom he met on a dating portal, Tobias plans to murder his wife in order to be rich and free. He already has a plan to make her disappear. But before Tobias Exner can implement his plan, he himself disappears without a trace. All lines of investigation lead Klaus Borowski and Mila Sahin to the mysterious dating contact...