"The essence of wisdom is to know when to be doing, and when it's useless even to try." - Mary Stewart in The Last Enchantment Seldom in Mary Stewart's telling of the Arthurian legend has it been useless for Merlin to try to affect events, and never when he's tried has he failed. But in this third installment of her series, Merlin is winding down. He feels his powers waning and longs to be able to pass off those powers to a worthy successor. Fortuitously, he finds such a successor - a most surprising successor. Or perhaps the successor was brought to him by his god, even though Merlin had believed that the god had withdrawn his hand from his life. This story, as in the two previous books, is once again told entirely in Merlin's voice, and after a while that makes for a pretty static narrative even when he is describing very active events. Arthur, in Merlin's telling, is never less than virtuous, honorable, magnanimous, and noble. Most of the...