After a family tragedy, Chris and Maggie Conley, in a last-ditch effort to save their dying marriage, purchase an isolated home in a secluded forest. When Chris leaves for days at a time to continue his training as a fire-fighter Maggie is left alone in their new house. But her emotional state deteriorates rapidly after a series of disturbing events. She becomes convinced that there is something unnatural sharing their house intent on her psychological destruction. But does some malicious presence really have the key to their front door or is there something even more alarming happening in the house of good and evil?