Olga Ivanova (Anastasiya Savosina) works as a school teacher, she is modest and kind. And her sister Katya (Natalya Bystrova) is the complete opposite, who gets involved in all kind of dubious histories at any opportunity. So here it is - a corpse on the carpet in the living room, a corpse in a country house... But this is just the beginning - someone really wants Olgas life. But who? Where, after all, is her troubled sister? Olga realizes that the killer has started a real hunt, and she can avoid the unenviable fate of other victims, only if she solves a complicated puzzle.