The Great Patriotic War. Soviet intelligence officers led by Sergei Skorin and Andrei Losev are trying to track down a well-trained sabotage group that is staging large-scale sabotage in the rear of the Red Army on the eve of the Battle of Kursk. Andrey and Sergey are brothers, but there has been a conflict between them for many years. Andrey does not trust Sergei, because he suspects that his brother has been turned upside down.
The year is 1967. A series of mysterious murders of women are taking place in Leningrad. An experienced KGB major, Chuzhbin, and a police captain, Fedorov, are assigned to catch a maniac who leaves mysterious signs next to the victims.
