Stephen R. Lawhead 
Grail [EPUB ebook] 
Book Five of the Pendragon Cycle

A great king faces the ultimate challenge: a dangerous quest through realms of magic and the undead toward a confrontation with his destiny Drought, plague, and war have left the Isle of the Mighty battered and its heart, the beloved Arthur, grievously injureduntil a secret relic is brought before the dying King; a Holy Grail that heals his wounds and restores his vigor.But soon evil enters the royal court in the guise of a beautiful maiden; a soulless, malevolent force capable of seducing the Kings loyal champion, confounding the sage whom some call Merlin, and carrying the sacred Grailand Arthurs adored Queenoff into the dark unknown.GRAILSuspenseful . . . soulful, philosophical . . . engagingly drawn . . . Arthurian Britain is invoked with robust verisimilitude. Publishers Weekly