Back in 1978, a prisoner named Andrei Petrov, nicknamed Cadet, neutralized a maniac strangler. He made friends and is making a career in the local police department, firmly intending to enter the Novoulyanovsk police school. It seemed that life had finally returned to normal. But fate brings challenges again. Adventures await him in Siberia. As part of a Moscow special group, he heads to sunny Khakassia to try to solve one of the most monstrous crimes...