In a small taiga town, a little girl from a dysfunctional family disappears. Investigator Demidov senses something is wrong and plunges headlong into the investigation. He also has a tense situation at home: both daughters are going through a difficult teenage period and dislike their father's new wife.

Kristya is found dead. Demidov tries to get the truth from her younger brother and suddenly plunges into painful memories of his childhood, and Zimin suspects he has cancer.

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