Seventeen-year-old Artyom is invisible in the family and a rebel in the technical school. He has a best friend, Kostya, and they do all the provocations and tricks together. When the management of the technical school compiles an unofficial list of dangerous teenagers - "explosives", Kostya, by pure chance, falls into the first place, which makes him popular among other students. Kostya revels in interest in himself - and betrays his friend, convincing his classmates that he, Kostya, is the main and only inspirer of all their antics. Then Artyom decides to prove who the “number one bomber” is really here. But on his way, a girl, Kira, unexpectedly appears, who is able to influence his dangerous plan.

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.

Katya is a successful lawyer and the best in her field. She makes a deal with her conscience and helps to put an innocent person in jail for a large sum. Having learned about Katya's actions, her son runs away from home. Together with his friends from the sports section, he decides to administer justice himself. And now the mother sets out to find her son, trying to fix everything.