Serial killer Zhanna Dronova, nicknamed the "female praying mantis", has been serving time in a maximum security colony since she confessed to eight particularly brutal murders. Jeanne killed only men - pedophiles, rapists and unfaithful husbands. Upon learning that she has a copycat, the woman offers the police assistance, subject to two conditions. First, she will leave the colony for the duration of the investigation. Second: her son Denis, who has not communicated with his mother for the last 20 years, will be in charge of the business.