At the beginning of the long twilight of a summer evening, Sam McPherson, a tall big-boned boy of thirteen, with brown hair, black eyes, and an amusing little habit of tilting his chin in the air as he walked, came upon the station platform of the little corn-shipping town of Caxton in Iowa. It was a board platform, and the boy walked cautiously, lifting his bare feet and putting them down with extreme deliberateness on the hot, dry, cracked planks