Two girls go swimming in the lake. Along the way, they are speaking about their everyday life as young women and problems of an adulthood. Swimming in the lake promises nothing special until one of the girls meets Mavka - mysterious creature from Ukrainian legends.
This summer, Ksenia, along with her mother and sister, is forced to pick blueberries in a Kyiv forest to earn a living for the family. But she is distracted by waiting for her lover Misha. Flirting, they go deeper and deeper into the forest, unaware of the danger.
