As bad lots go, you can't get much worse than the hordes of Mordor from J.R.R. Tolkien's "The Lord of the Rings." Led by an utterly evil disembodied entity who manifests himself as a gigantic, flaming, pitiless eye, and composed of loathsome orcs (or goblins), trolls and foreigners, Mordor's armies are ultimately defeated and wiped out by the virtuous and noble elves, dwarfs, ents and human beings -- aka the "free peoples" -- of Middle-earth. No one sheds a tear over Mordor's downfall, although the hobbit Sam Gamgee does spare a moment to wonder if a dead enemy soldier is truly evil or has simply been misguided or coerced into serving the dark lord Sauron. Well, there's two sides to every story, or to quote a less banal maxim, history is written by the winners. That's the philosophy behind "The Last Ringbearer," a novel set during and after the end of the War of the Ring (the climactic battle at the end of "The Lord of the Rin...