When Will and Rose start sharing nightmares they suspect that the cause is something more sinister than too much supper and sleeping on damp moss. And they're not wrong. Instead The Dreamwalker calls on Tym the Whizzard and Humfrey the Boggart, in the hope of unravelling the mystery. But will they be in time, or are their friends already in the clutches of the dreaded Knyghtmare?
