Hilltop Hall used to be a grand old English house; now it is an elite boarding school for girls. But the faded brick walls hide a dark secret... After a difficult start, fifteen year old Eliza (or Lizzy, as she prefers to be called) slowly begins to make friends at her new school. But the girls find themselves harassed by a group of bullies who seem intent on making their lives a misery. So they decide to seek revenge - but not in the usual way. Their quest for revenge leads these four girls to become involved in magic and the supernatural, not realising exactly what they are getting...