For centuries there has been a secret witch society. One of the witches included in it, the mentor Madeleine, is looking for her student Agatha Froment. Agatha's family moves to the small European town of Rimouth, where her father Pavel is given a job. Six months before the events described in the book, mysterious murders and disappearances of people occur in Rimaut. With her arrival, everything only gets worse... Agatha herself will have to understand who is to blame and what to do.