A weekend away turns bad when a furious snowstorm traps a group of friends in an isolated cabin high up Donner Mountain - a notorious peak named after a massacre that took place there some 150 years ago. As the snow rolls in and the sea of white consumes everything before them, they start to see strange apparitions. But is it just cabin fever playing tricks on their minds, or something altogether more sinister? As the frightening episodes become more intense, the friends will have to fight not only the elements but each other, as natural instincts kick in and the friends turn into bloodthirsty enemies. No one can be trusted, no one can be left alone. But can anyone make it out?