After getting in trouble with the law during a night of partying, spoiled Igor is forced by his father to take a police job and earn his own living.

While investigating the death of a maid who worked in a wealthy home, Igor learns new information about his late mother, who died when he was a child.

Korolyov learns his service weapon, which fell down a sewer drain, was used in a recent murder. Igor tries to access his mother's archived case file.

While pursuing an arms dealer, Vika gets in a life-threatening tangle. Igor tracks down the detective who investigated his mother's case.

Now a murder suspect, Igor tries to figure out who the real killer is in order to clear his name. Meanwhile, Korolyov hides a witness who could help.

Two bodies share an unlikely cause of death. Igor encounters an intruder at his home, and later has a revealing chat with a friend of his father.

Igor suspects Pryanikov is hiding information from him, and later meets his father's former bodyguard. Vika and her team search for a serial killer.

Igor's attempt to infiltrate a gang of young robbers results in a hostage situation. Pryanikov reveals to Igor what he knows about his mother's death.

The team investigates the vicious beating of a man having a meth-fueled party for two. Igor tracks down Dato to hear what he was stopped from saying.

When ex-fiancée Lera begs Igor to help her brother Stas, who was taken captive due to a big debt, the team launches an operation to catch his captors.

An attempt is made to kill Igor, and Lera is kidnapped. Hidden notes relating to Igor's father's first company reveal shady business activities.