2019. A small city in the Urals. Occult traders are special beings whose job is to keep warmth in cooling cities and to serve as a connecting link between people, cherubim, and devils. The main heroine, Praskovia, is an occult trader herself. She is two hundred years old, changes her appearance every four months, and cares only about a homunculus—her companion and assistant, who has taken the form of a child. But one day the homunculus begins to face danger…