The gatherings of two old comrades Seleznev and Kolesov end sadly. The next morning, the police find a sleeping Seleznev with a bloody knife in his hands and a dead Kolesov with a penetrating wound to the heart. Ira Poleva, a witness to the murder, first hides from Artyom, and then comes to the police station herself and testifies against Seleznev. However, the next day she is found with a serious injury in the park. The girl's phone will help detectives find the killer.

In the courtyard of the house, the child shows Artyom a gun, which turns out to be real. Artyom and Lena find a whole bag of weapons at the boy's house, which was stolen from an expensive jeep by his uncle, who was previously convicted. Operatives scour the market and come across a gang selling not only Chinese children 's toys.