When a middle-aged couple (James Remar, Lauren Holly) pick up a young woman, Joan (Emma Roberts), one cold winter night, that old truism about no good deed going unpunished comes to mind. Meanwhile, just a few miles down the road, two students and two staff members are the only residents left at a tony Catholic prep school for girls as it closes for winter break. The students’ parents have been delayed, they say, so there is no choice but to sit tight and wait. The same goes for the audience. But it’s soon obvious that something even more chilling than freezing temperatures is on its way, even if you will be hard pressed to guess just what form it will take...