"During the languid days of the Christmas break, a group of thirtysomething friends from Oxford meet to welcome in the New Year together, a tradition they began as students ten years ago. For this vacation, they've chosen an idyllic and isolated estate in the Scottish Highlands--the perfect place to get away and unwind by themselves. The trip began innocently enough: admiring the stunning if foreboding scenery, champagne in front of a crackling fire,...