Dan Walker answers the questions Mark Twain avoided: What if Huck really carries out his promise, at the end of The Adventures of Huckleberry Finn, to "light out for the Territory" and is caught up, as he surely would be, in the national crises of Manifest Destiny and the Civil War? Twain himself got sixty-two pages into his own sequel and quit. Why? Was he bored? Or was he afraid of the implications? Would the choices of a real maturity--of love...