The focus is on the married couple, the Belyaevs. Kirill and Anya have been living in peace and love for many years, raising their two children. Everything changes when a series of brutal murders shakes the quiet provincial town where the Belyaev family lives. The police struggle to find the culprit for a long time, but finally their efforts pay off. The main suspect turns out to be... the quiet and respectable family man, Kirill Belyaev. All the evidence points against him, and he also lacks an alibi at the time of the crime.