Sam Durelle and her younger sister are home alone when a knock at the door leads Sam down the road to terror. Abducted by a serial-killer couple, Sam manages toescape and find refuge in a desolate farmhouse, only to discover it is home to a malevolent spirit. Trapped in the house, Sam is propelled into a struggle for survival, one that will push her to the limits not only physically and emotionally, but spiritually.