In an abandoned park in one of the Siberian cities, an unknown person attacked a woman and, threatening her with a knife, imitated a violent act. Then, fleeing the crime scene, with a spectacular karate move he knocked out two athletes who tried to detain him. Investigator Andrei Laptev is confident that it is precisely because of his unique fighting qualities that he will easily find the attacker. But the further the investigators delved into the details of the incident, the more obvious it became that they needed to look not for a super athlete, but for a person with completely different, much more terrible abilities...