The murderer always follows the same pattern: According to an ancient punishment ritual of the Vikings, the "blood eagle", he literally executes his victims. So far, two women have fallen victim to the serial killer, a lawyer and a prostitute. Apart from their gruesome end, there doesn't seem to be any connection between the two. Chief Inspector Jan Fabel and his teammates Maria Klee, Henk Herrmann, the police psychologist Dr. Susanne Eckhardt and the new employee Anna Wolff are under great pressure to succeed. In addition to his superior, Fabel is also backed by an LKA officer who is showing unusual interest in the case. At the same time, the murderer engages the chief inspector in a macabre game by sending him emails with encrypted messages. Fabel feverishly pursues every lead. Nevertheless, the wanted person is always one step ahead of his pursuers. Soon the landlord of the murdered prostitute, Hans Klugmann, is targeted by the investigators