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; 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.