 An epic snowstorm interrupts their vacation, trapping them on the mountain and resurrecting the haunting ghosts of the Donner Party.They struggle to find out whether these are the true demonic 'entities' or if it is simply 'cabin fever' that is bringing out their fears and paranoia, causing friends to turn against each other as their reality deteriorates around them.The film began principal photography on January 19, 2008 in South Lake Tahoe California.