The elderly criminal authority Semyon Timofeevich Babushkin, about whose thieving talent legends were made up at the time, has not left prison for the last 35 years, preferring it to freedom, where he has no friends or relatives left.

In the center of the plot is Ivan Lutoshin, a neurologist by profession and a loser in life. He finds out that he has an inoperable brain tumor and he has six months to live. He decides to commit suicide: after getting drunk, he goes out on the expressway and stands on the lane. But the car manages to pull out of the road. Police operative Tumanov is driving: after learning about the problem of a random acquaintance, he offers him to participate in deadly operations to catch bandits - if they kill him, then at least not in vain.

A company of carefree guys, passionate about computer shooting games, infiltrates a private laboratory where a military action simulator is being developed. Entering it, they find themselves in a world where the environment and what is happening are indistinguishable from real life. The guys manage to load into the "closed level" unfinished by the developers, where Belarus of 1942, occupied by the Nazis, is modeled. There, the guys are face to face with a real, not a computer war.

Year 1944. Shortly before the start of the Crimean Offensive, the ships of the Soviet Black Sea Fleet and the Azov Naval Flotilla are in serious danger: German underwater commandos are preparing a large-scale operation to destroy the main combat units of the Soviet fleet in ports and roads. Aware of the seriousness of the threat, the Soviet command is developing an operation to detect and destroy the main base of the German underwater saboteurs.

Nick's investigator goes on the trail of a maniac nicknamed the Sculptor, who immures young girls alive in plaster. Upon arrest, she beats the villain to a critical condition: the maniac falls into a coma. Two victims have not yet been found, and Nika decides to cooperate with former psychotherapist Maxim, who allegedly knows how to read the minds of others.

June 21, 1941. Young lieutenant Kolya Pluzhnikov, having received an appointment to a permanent place of service, arrives in Brest. The crowded waiting rooms of the station and the crowd of people weighed down with luggage do not alarm the young man, filled with joyful hopes. Kolya hurries to the location of his unit - the Brest Fortress... The soldier does not have time to enlist in the personnel of the military, and at four in the morning artillery explosions are heard - the war has begun. He was not enlisted in the ranks of the military personnel of the Brest Fortress, but still took part in the first battle in his life, which lasted ten months.