Girlfriend. A battalion commander dies from an assassin's bullet. There is too much evidence against him, and Rublev takes up his own investigation. This man is not used to collecting details bit by bit, his investigation is reconnaissance in force. The battalion commander will have to infiltrate one of the mafia groups that has launched its tentacles into law enforcement agencies and government bodies. He will arrange fireworks in the Caucasus Mountains and become the bodyguard of an influential Duma deputy. Serious matters are unfolding: from the transit of smuggled alcohol to the sale abroad of prototypes of a top secret orbital aircraft. Sooner or later, the double game will come to an end - the Battalion Combat will enter into battle with its “masters.” But then new forces intervene. — Rublev’s life hangs by a thread...