The main character of the story is Major Ivan Sobolev, an officer of the Ministry of Internal Affairs, who travels to the Russian capital and soon becomes the prime suspect in a particularly serious crime. The other law enforcement officers are unaware that he is their new leader, specifically the head of the criminal investigation department on Tverskaya Street. Before moving to Moscow, Sobolev fought in hotspots but was injured and unable to continue his service. Sobolev's arrival at "Tverskaya" changes the lives of the other employees.