Emlyn and Maxine's paths cross in modern day Scotland when they are both drawn to the ancient site known as Sleeper's Spinney, and together they unleash an unearthly power by removing a wooden carving. Containing the trapped spirits of King Arthur and his men, the carvings have been held in check by a long line of Keepers. With the Keepers prepared to stop at nothing to recover what has been stolen, Emlyn and Maxine are drawn into a world of myth, magic and the supernatural.