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

At the dawn of his reign, a young king confronts his destinyand must prove his greatness . . . or lose a realm Arthur is Kingbut treachery runs rampant throughout the beleaguered Isle of the Mighty. Darkest evil descends upon Britains shores in many guises. Fragile alliances fray and tear, threatening all the noble liege has won with his wisdom and his blood. His most trusted counselorthe warrior, bard and kingmaker whom legend will name Merlinis himself to be tested on a mystical journey back through his own extraordinary past. So in a black time of plague and pestilence, it is Arthur who must stand alone against a great and terrible adversary. For only this way can he truly win immortalityand the name to treasure above all others:PENDRAGONThough Lawhead brilliantly creates an authentic and vivid Arthurian Britain, he never forsakes the sense of wonder that has graced the legend throughout the ages.Publishers Weekly