"Sioned, an illegitimate child of a princess of the Celts and the late King of England, is heir to twofold magic: the faery Sight of ancient Wales and the demonic powers of the Devil's brood of Anjou. Summoned by her brother, Richard, to save both the Crusade and his soul, Sioned receives help from two unlikely allies - a prince of the infidels and an army of the jinn - as she races against time and the powers of the darkness. But with the extent of her abilities still untested and only her instincts to guide her, will she be able to swing the sorcerous struggle back toward the powers of the light?"--BOOK JACKET.