Mourning his son after a tragic accident, Staff Sergeant Samuel Mulwrey must command his Army Ranger platoon during cold-weather training in the wintry wilds of Alaska. It's his last chance to pull his troops - and himself - together. After a blinding whiteout separates Mulwrey and three other Rangers from their unit, they seek refuge in what seems like a cheerful, homey chalet nestled in the savage wilderness. Except nothing is as it appears. The place possesses a dark and disturbing history. As the Rangers warm themselves, someone - or something - stalks them all with an unquenchable...