Steven Harding is a handsome, well-respected professor. Ellie Masterson is a wide-eyed grad student. Together, they are driving south from New York for their first vacation: three days in an isolated cabin, far from the city. Ahead of them, the promise of long, dark nights--and the chance to get to know each other better, away from prying eyes. It should be a perfect romantic getaway for two. But when a snowstorm strands them in the house, each realizes the other harbors a dangerous secret--and soon it becomes clear one of them won't escape the weekend alive.