In the middle of winter, Sling and his pal Henson are forced to crash-land their plane in the wilderness of Montana, and take shelter in an abandoned hunter's shack. Soon after, a pair of sisters, lost in the woods searching for their dog, join them in their solitary plight. As the four of them struggle to stay alive in a distinctly inhospitable environment, they are forced to confront not only the elements but the fears and demons that lurk inside them all.