Na strazhe plyazha – Denis Dubov used to work as a forensic expert, but lost his job due to a romantic relationship with his boss's wife. He was forced to learn a new profession - a cleaner. The main character now cleans up places where various crimes have taken place. While working in another apartment, Dubov suddenly realizes that he has become an unwitting participant in a criminal operation. The criminals want to destroy valuable evidence with his help. Dubov is willing to cooperate with the investigation, but he has his own conditions.
