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