The Russian detective-melodrama series "Investigation of Love" tells the story of a talented investigator and a mother of many children, Nadezhda Polyakova. She is raising three children - Veronika, Nikita, and Petr. The birth of her youngest child became destructive for her family life. While Polyakova was taking care of her children, her husband found a mistress. Upon learning about this, Nadya demanded that he leave. Polyakova couldn't forgive the betrayal, as she saw it as a betrayal.