A new Dark Age has fallen across Britain. With the sudden return of magic, our modern, technological society has crumbled. Cities lie in ruins, communications are limited. Gods and monsters walk the land. The plague came without warning. Nothing could stop its progress: not medicines, not prayer. Caitlin Shepherd, a lowly GP, is allowed to cross the veil into the mystical Celtic Otherworld in search of a cure; her search takes her on a quest to the end of a land of dreams and nightmares to petition the gods. Caitlin is humanity's last hope, but she carries a terrible burden: a consciousness shattered into five distinct personalities, and one of them may not be human.