While investigating a murder, Natalia finds out that her son has cancer and needs an urgent surgery; in exchange for the release of a suspected killer, a mafia boss offers Natalia money for her son's surgery.

After accepting the offer, Natalia organizes the killer's escape; Natalia agrees to cooperate with the FSB; the mafia boss vows to kill Natalia.

After attempt on her life, Natalia joins the Witness Protection Program while her son recovers from surgery.

With the mafia boss still searching for her, Natalia settles in a small town not far from Moscow; after a second unsuccessful attempt to arrest the mafia boss, the FSB investigator suspects a mole.

Natalia's son recovers from surgery and asks about his mother; not wanting to hide anymore, Natalia sets out to find the mafia boss.

Natalia attempts to get the mafia boss's attention; Natalia's mother dies and her son is taken to an orphanage.