Sent to live in a foster home in a remote Yorkshire village, Matt, a troubled fourteen-year-old English boy, uncovers an evil plot involving witchcraft and the site of an ancient stone circle.

As fourteen-year-old telepathic twins struggle to escape the clutches of the Nightrise Corporation, one of them travels through dreams to a time when the evil Old Ones ruled and learns the role that he, his brother, and three other Gatekeepers must play to keep the world safe from the Old Ones' return.

To save Groosham Grange, the strange boarding school he attends where ghosts and ghouls rule the academy and students study witchcraft, David Eliot must win the Unholy Grail, a magical cup awarded to the star pupil.