In an abandoned park in one of the Siberian cities, an unknown person attacked a woman and, threatening with a knife, simulated a violent act. Then, hiding from the scene of the crime, with a spectacular karate technique, he knocked out two athletes who tried to detain him. Investigator Andrei Laptev is confident that it is for unique combat qualities that he will easily find the attacker. But the further the operatives plunged into the details of the incident, the more obvious it became that it was not a supersportsman who needed to be looked for, but a person with completely different, much more terrible abilities...