The TV series "Security" is a Russian detective story based on the novel "Zone of Personal Security" by Andrey Kivinov. The story revolves around the employees of the Department of Personal Security, the most secretive and confidential unit of the police. Captain Olga Gorina receives a tip-off: according to an informant, Kirill Kopeikin, an operative of the criminal investigation department, is guilty of several murders. However, the victims of the man are only drug dealers. Either the killer sees himself as a hero or he is defending certain personal interests.