Maryana and Ulyana Karelin are twins. But they are similar only in appearance, but in character and way of life they are completely different: Maryana is an active careerist, a month ago she assumed the position of general director of the TV channel and began a tough fight against financial fraud. Ulya is a soft, gentle, non-conflict, hummingbird girl. One day, alarmed by something, Ulya made an appointment with her sister. They agreed to meet at Maryana’s house, but when the hostess, who was a little late, crossed the threshold of her apartment, she found Ulya strangled... The investigator is sure that the killer mixed up the sisters and will strive to correct the mistake. But soon Maryana discovered a letter in Uli’s email that changed her whole life...