A teenage girl from a marginal family meets a real witch by the will of circumstances and becomes her assistant, discovering unprecedented opportunities in herself. The story of a young student and her mentor, starting in the gray everyday realities, is smoothly transferred to a place hidden from ordinary people, full of magic and incredible secrets. But not everything in the world of magic is as rosy as it seems at first glance. The trade of souls, forbidden spells, powerful sorcerers, insidious alchemists, hungry parasites - Catherine's life will be exposed to the dangers of this cruel, insidious and very dangerous world every minute, and she will think more than once about who she is and where her place is.