Москва — Ленинград

Thanks to the surveillance installed on Zoya, it is possible to establish that she is engaged in prostitution at Intourist. While Ipatiev is trying to figure out how threats to Gavrilov and Zoya's occupation might be related, Kovalsky travels to Leningrad, from where a letter was sent to Samoilov's sister in Krasnodar. But it soon becomes obvious: Samoilov is not in the city — a new victim of the maniac has been found in the Moscow region.