Nathan Ward, raised under the protection of old Bartlemy in the small English village of Thornyhill, begins having dreams of a magical world known as Eos, and of a greenish stone cup set with jewels, and his life becomes a dangerous adventure when pieces of his dreams begin to materialize in real life.

The concluding part of the captivating Sangreal trilogy from the author of Prospero's Children. Like most young people, when Nathan Ward sleeps, he has adventures. But unlike most people, Nathan cannot relish the escapism, for his dreams are not fantasies; his adventures are real and the nightmares he faces in them can keep him from ever waking up.