Maryana Igorevna, the mother of the recently released Yartsev, who was serving time for the rape and murder of a girl, was found dead in her apartment. In the course of the investigation, a very strange story emerges: the murdered woman accidentally discovered videos of her son's sexual entertainment with her friend Nadezhda and decided to start an investigation into another long-standing rape case, "according to the handwriting" of her son, whom she thought was close. Yartsev's new girlfriend Zhenya claims that on the night of his mother's murder he was not with her, depriving him of his alibi ...