The Legend of Big Hat Billy

Billy is staying at his grandparents farm, while his parents are off digging in the dirt somewhere, they're arche something, he can't begin to fathom how digging in the dirt for old junk is worth anything, when he digs in the dirt, he gets in trouble. His parents do it, they get highly paid. One day, Billy comes home from school, no grandparents to be found, though all the vehicles are on the farm. When they don't show up by suppertime, he does what mom taught him, he dials nine one one, not sure if it's a big enough emergency to call, but it is for him. Where are his grandparents? For that matter, where are his parents, nobody seems able to contact them.