Major of the police Anastasia Kamenskaya receives a promotion - she is transferred from the district office to Petrovka, to the department headed by Colonel Viktor Gordeev, nicknamed Kolobok. Nastya is connected to the case of disclosing the mysterious murder of Irina Filatova, an employee of the Research Institute of the Ministry of Internal Affairs. She does not even suspect which mortal game was involved ...

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An accidental crime, leads Kamenskaya to a closed research institute, where experiments are conducted with secret developments that affect the psyche of people. Nastya notes a strange pattern of crimes occurring in the area of ​​the institution's location. And after the first serious contact with the leadership of the scientific research institute, she is subjected to an attempt. When this happens again, it is saved by an unknown person who introduced himself as a passerby to random people. Kamenska, luring the savior to her home, "splits" this guardian angel, who turned out to be an employee of the FSB. There, to the very top, and led the threads of the investigation of the murder of one of the Institute's scientists ...

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On the same day, in different registrar offices of Moscow, the bride was killed in a shot at point-blank range. Red on white - this is the combination of colors seduces an unknown maniac. Is it possible that an abandoned woman avenges others' happiness? By coincidence, Anastasia Kamenskaya, who is getting married, is in the same registry office with the murderer. Perhaps, the pictures taken by the photographer who works at weddings will help the investigation ...