The Endless Knot — Stephen R. Lawhead

Once Lewis Gillies crossed from Scotland into another realm of war and wonder. Now called Llew Silver Hand, he has ascended the throne of Albion--a High King celebrated in word and song. But an evil malaise has befallen the land, turning pastures into wastelands and sweet streams into poisonous rivers. A terrible fire is raging unseen, drawing the darkest forces to its invisible flame. For the Brazen Man defies Llew's sovereignty, and the final battle has begun--one that calls Llew into the Foul Land to redeem a sacred treasure in order to save the world he rules...and the one he had abandoned.