Studious schoolboy Wally and his feisty friend Bessie suddenly find themselves plunged into a world of Celtic sorcery and magic. There is a major battle looming between warring covens and clans of witches, goblins, elves, lyths and trolls. Can the young teenagers find the missing pieces of the Pentacle of Northumbria in time to help their friends meet the growing menace from the dark forces of magic?