Eberhard Mock is back. The hero of Marek Krajewski's already cult detective series will once again encounter the dark secrets of the former Breslau. Wroclaw, 20s of the last century. Two prostitutes accept an unusual offer. Soon after this, the police find their corpses - during the meeting, the girls were strangled, and their tormentor knocked out their front teeth. Trying to solve the case is nadvahmistr (senior sergeant) Mok, known for his sympathy for women of easy morals. Suddenly the roles are reversed and the pursuer becomes the pursued. At the same time, a certain man with mint breath, having published an advertisement in the newspaper with condolences to the families of the victims, is trying to establish contact with a powerful secret brotherhood. The condition for joining the group is to kill the “human scum” and prove your guilt...