Sam Stone appeared out of nowhere a decade ago - a ghost on the muddy Gulf Coast - denim-clad and wandering. He now earns a meager living etching tombstones in the blazing Florida sun. On his lunch break, he checks an eternally empty P.O. box and mails out cryptic envelopes filled with cash. At night, he holes up in his rent house and shuts out the world. Sam's hermit lifestyle is thrown into chaos after a massive sinkhole inexplicably swallows his neighbor's front yard in the middle of the night, leaving his house temporarily uninhabitable. Sam drifts from mausoleums to motels until he meets...