CrossersBy: Philip Caputo When Gil Castle loses his wife, he retreats to his familys sprawling homestead out west, a forsaken part of the country where drug lords have more power than police. Here Castle begins to rebuild his life, even as he uncovers some dark truths about his fearsome grandfather. When a Mexican illegal shows up at the ranch, terrified after a border crossing drug deal gone bad, Castle agrees to take him in. Yet his act of generosity sets