The lava of the Port police is conducting an operation to detain Rosgvardiya fighters, during which all suspects of robberies of cash collectors are killed. Vershinin learns that the Russian Guards were shot by an unknown sniper. Meanwhile, the medical examiner reports information about the deaths of people found at the bottom of the lake: they were all killed in the same way, and the perpetrator did everything to ensure that their bodies never surfaced.

Oparin, an employee of the Ministry of Emergency Situations, informs Vershinin that he recognized a USB investigator among the dead recovered from the bottom of the lake. The man also worked on the case of the missing assistant prosecutor. However, the glass eye, by which he could have been identified, strangely disappeared before the bodies arrived at the medical examiner. Meanwhile, a boy who disappeared from an orphanage is found dead.