The action takes place in September 1941. Unfairly convicted MUR investigator Zakhar is released from prison in order to organize the fight against crime, which increased with the beginning of the German invaders offensive on Moscow. The hero is tasked with heading the special investigations department and unraveling a tangle of mysterious crimes committed by Nazi collaborators. Once free, he fights a gang of saboteurs. Victory in this battle will not only be his contribution to the overall Victory, but will also allow him to free his wife, who was arrested with him, from prison. The leader of the sabotage group, Pavel Tursunov, also has his own goal - he is obsessed with personal revenge on Stalin, whom he blames for the death of his parents.