The autopsy confirms the worst suspicions. Karolina and her sister try to inform their mother about the discovery of the body, but they cannot contact her. Is it possible that the woman knows much more than she claimed? At the same time, Karolina At her own request, she is assigned to investigate a murder in a den. He becomes acquainted with the suspect's girlfriend, Jagoda, who claims that her boyfriend was framed.

Irena is arrested. Her stay there is a shock, and her fellow prisoners seem hostile. Karolina, convinced of her mother's innocence, starts her own investigation. Meanwhile, Jagoda gives Karolina and Michał another clue in the case murders in the den. Karolina follows her father's recent affairs and makes a surprising discovery in her parents' house.