Mariana could not get used to the idea that her happy family was no more. Sister Zhanna and little niece Dasha died while on vacation on the Black Sea - they stumbled on a cliff and crashed on the rocks. Zhanna's husband is inconsolable; he has moved away from his wife's family, although he used to love his father-in-law and mother-in-law very much. And suddenly Ilya said that Zhanna herself jumped off the cliff with her daughter! But what pushed the sister, who was quite happy with life, to do this terrible act? Trying to find out this, Maryana unwittingly found herself involved in events that defy logical explanation. Horror became a constant companion in her life, but she was not going to retreat. Especially after I found out that Zhanna and Dasha were not the only ones who died so unexpectedly and strangely, and similar deaths were repeated every three years...