They come at night. Forward. A stranger staggers out of the wilderness under the cover of a blizzard and stumbles into a diner full of people. He collapses in the entryway, unzips his jacket, and allows the object hidden inside to fall out. Screaming commences. Down. Four old college buddies embark upon their annual elk hunting trip into the Rocky Mountains. This promises to be their last, for the passage of time is as merciless and unpredictable as the Colorado weather. And they’re not alone. Help. There are other hunters in the mountains, stalking game of a different breed. They know exactly what they’re doing, because they’ve been hunting in these woods for a long, long time. And no one ever survives to betray their existence.

There are some places man was never meant to go. For the past seven years, John Avery has been combing the wilderness for any sign of his missing girlfriend, who set out upon the ski trip of a lifetime and was never seen again. Regions utterly isolated by geography and time. The discovery of a video camera prompts Sheriff Wayne Dayton to dispatch a search party into one of the most remote areas of the Rockies in hopes of learning her fate. Where few species can survive. When a freak blizzard strikes, they find themselves wandering blindly into the killing grounds of a predator they can't even see.