There’s a storm coming. What the locals call a “killer storm”. Mandy, a forest ranger, is assigned to a remote cabin deep in the Chippewa Forest for a couple of months. As the blizzard sets in, a man knocks on the cabin door claiming to be a lost hiker. But is he really who he says he is? And why is carrying around a hunting knife? Soon they find themselves trapped inside the cabin while the storm rages on and something massive and ravenous tries to break in.