Twelve-year-old Bea lives with her mother Ula and her owl Pip in a cottage on the wild moors. Since the day the dreams disappeared, and an affliction of nightmares began sweeping across the lands, everyone is leaving and their settlement is being abandoned. But when Ula grows sick with the affliction, she won't leave - and she's keeping a secret from Bea.
Just as Bea begins to despair, the mysterious Night Train steams across the moors, bringing a stranger who offers her the chance to save her mother. Bea is flung into a faraway adventure in the world of the Dreamstalkers, skilled warriors and performers who must go to work each night inside the dreams of the powerful. But the nightmares are following close behind.