A scene straight out of a horror film: the prisoner Miroslav Katcek is thrown into a completely uncontrolled tantrum in the prison hospital, foams at the mouth, screams, bites and spits. Eventually he collapses, collapses and dies. Jonas Zander, the former forensic doctor, asks the entire investigative team for an interview: Zander explains to Martina Bönisch, Peter Faber and Nora Dalay that he was murdered. Which seems unusual considering he's alive in front of the team. Zander was infected with rabies; the symptoms are already so advanced that there is no longer any chance of recovery. Jonas Zander only has a few days to live. He has only one wish left: that Faber and his team find his killer before he dies.
Zander was during astabbing in the prison, where he now works as a doctor, together with the deceased prisoner Miroslav Katcek. In the course of the highly complex investigations, Faber and his team meet old acquaintances: The prisoner Markus Graf, who has Faber's wife and child on his conscience, could - perfidiously as he is - have something to do with the "murder" of Zander - soon find out there are indications that the Albanian mafia is behind it and wants to bring unrest to the prison about the rabies attack and thus implement an escape plan. While the three remaining inspectors determine how exactly the virus was smuggled into the prison, the mood in the prison boils more and more and they meet a colleague working undercover, the young Jan Pawlak.