"Ya znayu, kto tebya ubil" is a detective series based on the novel "Eva" by Lyubov Barinova. An unknown person kidnaps a three-year-old girl right in the middle of a performance at the Moscow Circus, where she came with her parents. However, there are no expected threats or ransom demands. The kidnapper clearly has a more personal and deeper motive. The detectives have to delve into the family's past to find any leads. It turns out that the kidnapper is seeking revenge, wanting to inflict the same pain on the parents that he once experienced himself.