The Fall of the House of Walworth by Geoffrey O'Brien; Henry Holt, 337 pages ($30). We should have known something was up when the venerable and irreplaceable Library of America suddenly produced one of its elegant volumes devoted to true crime writing in America. Among other things, it contained the remarkable news that the contemporary ranks of Ann Rule and Dominick Dunne once included such masters of American prose as Benjamin Franklin, Nathaniel Hawthorne and Mark Twain (editor Harold Shechter even managed to squeeze something for the genre out of the writings of Abraham Lincoln).