Major Nastya Kamenskaya is the most beautiful detective of Moscow criminal police. She is as attractive as intelligent and shrewd. Kamenskaya investigates suspicious deaths and disappearances in a psycho-clinic, finds a maniac who chases fans of a pop-group, unravels chain of drug-addicts' kidnapping. In the last part of the film the insane murderer sentences people to death for each of seven Bible's mortal sins. Six people are already dead. Nastya discovers that the seventh victim is herself. The screen version of best-selling novels of "Russian Agatha Christie" Marinina became a TV best-seller as well.