The professional interest of private detective Olga Paleva leads her to investigate a series of murders that rocked a quiet town near Moscow. How to determine the line separating a law-abiding citizen from a seasoned murderer who despises human laws? How much does it take to cross this line? In such cases, it becomes important for the investigator not only to identify the criminal, but also to understand the depths of human psychology, to get to the bottom of the motives that push a person to commit the seemingly unthinkable. Extraordinary talent, fortitude and integrity help Olga brilliantly solve the most complicated cases. But will it work this time?