Have you ever wondered what happens when the ruler of the underworld, Zegrehálida, suddenly loses her powers and finds herself in the body of an ordinary schoolteacher?
A powerful witch, Ursula—known for her demonic rituals and her dominion over the underworld—by sheer chance (or not?) ends up in the world of people, in the body of a young and kind Olga Ivanovna.
Now she must not only get used to her new form, but also deal with an entire class of restless children. She’ll have her loyal familiars to keep her company: a sarcastic cat, Leviathan, and an eccentric flying bat, Bartholomeo, who—just like their mistress—don’t fit very well into the school’s peaceful atmosphere. Will Ursula be able to use her demonic knowledge to solve the problems in the classroom? And how will she cope with the fact that there is clearly a magical force present in the school?