在这部观察者恐怖片中,男主角是个可怜人。从年幼的儿子死去之后，他的婚姻就变得有名无实，濒临破碎。他本人一蹶不振，穷得破产，只好去做私家侦探。一天，他被雇佣去监视一个年轻美丽的女人，跟着她到了一座诡异的旧楼。从那天开始，他就像是被恶灵缠身一般，陷在噩梦里。
In the grip of grief following the death of his young son, his marriage on the rocks and nearing bankruptcy, Parker reluctantly returns to work as a private investigator. Embarking on an unusual assignment to observe a woman from an abandoned apartment, Parker witnesses bizarre happenings surrounding her, unaware that the derelict building that he surveys her from has birthed a dark presence which slowly threatens to consume him.
