Young curator Nora Kelly is approached by historian Clive Benton with a once-in-a-lifetime proposal: 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 snow-bound 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 tells Kelly he has come across an amazing find: the long-sought diary of one of the victims, which has an enigmatic description of the Lost Camp. Nora agrees to lead an expedition to locate and excavate it. But as they uncover old bones, they expose the real truth of what happened, one that is far more shocking and bizarre than mere cannibalism.