Two mutilated corpses are found in an empty cafe. Even the police officers, who had seen a lot, were shocked by the monstrous cruelty of the killer. Rumors immediately spread throughout the city - a maniac capable of brutal reprisals was operating in the vicinity. And there is already a suspect - a patient who escaped from a psychiatric hospital set up in a former monastery. But a historian from a local school strongly doubts this. He is sure that there is a sect of Satanists operating in the city, and the patient is a soothsayer, whom the authorities have put in a mental hospital. And to get evidence of this, you need to look into the depths of history...