A mummified corpse is found in the cellar of an abandoned building in a remote New Mexico ghost town. Rookie FBI Agent Corrie Swanson is assigned to ID the body and determine the cause of death. She brings archaeologist Nora Kelly to excavate the body and lend her expertise to the investigation, and together they uncover something unexpected and shocking: the deceased apparently died in agony, in a fetal position, skin coming off in sheets, with a rictus of horror frozen on his face. Hidden on the corpse lies a 16th-century Spanish gold cross of immense value. When at last they identify the body --- and the bizarre cause of death --- Corrie and Nora open a door into a terrifying, secret world of ancient treasure and modern obsession.