Moritz Eisner and Bibi Fellner face an absolute professional in the face of a mysterious series of murders. First the masked killer kills a tattooed Serb, then the inconspicuous Georgian employee of a large nursery and finally a young mother. Each time the perpetrator leaves no traces, but a shocking staging: He spectacularly displays the violated corpses in places where so many people are on the move that the police cannot find any usable DNA traces. Ritual murders, sexual crimes or even a secret service killer squad - Fellner and Eisner have to investigate in all directions. Even with the victims, who all lived under a false identity in Vienna, there is no clarity. When the investigators come across a mutual acquaintance of the victims, the university professor Nenad Ljubic, who specializes in Eastern European civil rights movements, the case finally moves.