Frightening changes are happening to Yulka, the sister of sixteen-year-old Marfa. Trying to figure them out, Marfa begins to follow her sister and ends up in Lopuhi, an abandoned village among the forests. It turns out that Yulka is in big trouble and only the key keeper - a sorcerer who lives as a hermit near a mysterious bow - can save her. Finding his house is not easy, but it is even more difficult to get the moon milk, which the key keeper demands as payment for help. Author's notes: Since March 11, the book has been published on Litres. Anyone can purchase it there - Attention! Voice-over of the story is prohibited.