Polina officially joins the department and becomes Igor's skeptical partner. The team is called to investigate the mysterious death of a security guard at the Fortuna bookmaker. The new case turns out to be closely related to the disappearance of her sister Olya. In Fortuna, Polina meets the charismatic and mysterious Maxim Belyakovsky.

Polina is confronted with a deadly vision in her new rented apartment, which reveals the terrible death of a strange girl. Investigating a mysterious death, she and Igor embark on a chain of strange deaths, each disguised as an accident. In parallel, Polina is overtaken by a blow from the past related to her missing sister.

Elsa and Arkady, the finalists of the show "Yes, chef!", sort things out live, and the next day Arkady is found dead. While investigating the cook's death, Polina and Igor learn about his double life, the stakes, and dark deeds from the past that could lead to tragedy. At the same time, Polina begins her own investigation into the disappearance of her sister Olya.