It's 1932, and twelve-year-old Cal Black and his Pop have been riding the rails for years after losing their farm in the Great Depression. Cal likes being a "knight of the road" with Pop, even if they're broke. But then Pop has to go to Washington, DC--some of his fellow veterans are marching for their government checks, and Pop wants to make sure he gets his due--and Cal can't go with him. So Pop tells Cal something he never knew before: Pop is actually...