The main character of the detective-melodrama series "Companion" is a young photographer named Elizaveta. At one of the social events, she meets businessman Oleg Orlov. He confesses that his daughter is seriously ill and asks charming and kind Lisa to brighten up the girl's leisure time. She becomes a companion and best friend to little Sasha. It turns out that the girl constantly sees her dead mother in her dreams, calling her to the grave. No one believes the child until Lisa herself sees the "ghost".