The latest nail-biting thriller from New York Times bestselling authors Preston & Child. Nora Kelly, a young curator at the Santa Fe Institute of Archaeology, is approached by historian Clive Benton with a once-in-a-lifetime offer to lead a team in search of the so-called "Lost Camp" of the tragic Donner Party. This was a group of pioneers who became snowbound in the California mountains in 1847, their fate unknown until the first skeletonized survivors stumbled out of the wilderness, raving about starvation, murder, and cannibalism. Benton informs Kelly that he has discovered an incredible find: a long-sought diary of one of the victims, which contains an enigmatic description of the Lost Camp. Nora agrees to be the expedition's leader.