Alarm in Kiel: In the event of an uprising in the forensic clinic, the murderer of women Kai Korthals manages to escape from security detention. Korthals, who stalked and killed numerous women in their apartments as a "silent guest", became Borowski's personal nightmare six years ago when he kidnapped his fiancée Frieda Jung. At that time the inspector managed to free Frieda, but his relationship broke up. Commissioner Mila Sahin wants to hunt down Kai Korthals by all means. But is Borowski ready to face his adversary again? In Kai's cell there are letters from admirers. Apparently, numerous women were attracted to the killer and made promises to him, including Teresa the telephone counselor. These women are now in grave danger. Before long, the body of a young woman is found on the bank of a lake. A dangerous hunt begins, in which Borowski initially refuses to take part.