While in the Moscow region at a psychological seminar, Marina unexpectedly meets her sister. She is clearly trying to hide from someone in an unknown place. That evening she dies by drowning in the river. Marina is sure that her death is not accidental. Learning many details from her sister's personal life related to her money and her men, the woman is increasingly exposed to danger. It turns out that now her sister’s dark acquaintances need her heir – her. And for a variety of reasons...