年轻的姑娘卡罗琳（凯特•哈德森 Kate Hudson 饰）受雇于老妇人维奥莱特（吉娜•罗兰兹 Gena Rowlands 饰），前往她家照顾她卧病在床的丈夫本（约翰•赫特 John Hurt 饰）。维奥莱特的大房子坐落于以神秘习俗和宗教仪式闻名的地区，卡罗琳刚到这里就觉得阴森诡异。随着日子一天天过去，卡罗琳渐渐对这件大房子和古怪的维奥莱特起疑。一次偶然，她从维奥莱特那里得到了一把万能钥匙，用它可以打开这座大房子的所有房间。当卡罗琳走进了隐藏在顶楼的房间时，她看到了令人惊悚的一幕，直觉告诉她，本的卧病在床和维奥莱特以及这间房间有着莫大的关系，她决心揭开这个迷！
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