Former Navajo Tribal Police Lieutenant Joe Leaphorn is coming out of retirement to help exonerate a slow, simple kid accused of robbing a trade post. Billy Tuve claims he received the diamond he tried to pawn from a mysterious old man in the canyon, and his story has attracted the dangerous attention of strangers to the Navajo lands - one more interested in a severed limb than the fortune it was attached to; another willing to murder to keep lost secrets hidden. But nature herself may prove the deadliest adversary, as Leaphorn and Sergeant Jim Chee follow a puzzle - and a killer - down into the dark realm of Skeleton Man.