Synopsis: From the back cover of the Baen first edition: "What matter promises to them? They're only human! - His honor riven from him, elven Prince Ardagh suffers that worst of all possible fates: banishment to the world of humans. Alone in a land of Christian kings and viking raiders, Ardagh has at last learned to make his way - more, he has made himself a place: he is much valued by his friends and comrades at arms. His fate is beginning not to seem so terrible after all. But now, Ardagh, he who was falsely branded "Oath-Breaker", is called upon to defend Ireland against the fierce magic of an Anglo-Saxon menace and so fulfill his pledge to human King Aedh. Though it may well cost him his immortal life, fiercely, joyfully Ardagh - no oathbreaker he - joins the fray. Then in the midst of war, he is summoned to rejoin the Sidhe. His choice is stark and clear: to stand by his sworn comrades or regain all that he has lost and to be in truth as well as name Ardagh Oathbreaker."