DavidPetersenispassingthroughtheColoradoRockies.Aftersavingayoungdinerwaitressfromherviolentex-husbandduringabreakfromdriving,hehitstheroadagainalonethroughadangeroussnowblizzard.Onefalsemovebehindthewheelhashimwakingupinsidearavine,intheeyeofthestorm.Butthecoldistheleastofhisworrieswhenabeaststartsprowlingoutsi..