影片一开始便在伦敦阴冷的空气中植入了恐怖的氛围。美丽的吉娜(琳娜·海蒂饰)在医院放射科工作，她和男友Stefan（梅尔维·珀波饰）为父亲的生日筹办了一个派对晚宴，吉娜的弟弟丹尼尔和弟媳凯特也悉数出席。吉娜的父亲为是美国驻伦敦大使馆的工作人员，很快就要退休了，生日宴会的欢乐气氛突然被打断 ——餐厅墙壁上的一面大镜子猛然碎裂成片，没有任何人为因素。一种不详的预感弥散开了。第二天，吉娜在医院工作时，同事很奇怪地告诉她：刚才明明亲眼看见她离开医院了。她并没放在心上，但是随后她惊愕地发现自己的红色切诺基正行驶在街上，而坐在驾驶位上的是一个和她长得一模一样的女子！出于好奇，吉娜一路跟随她来到了一栋陌生的公寓，那个女子上了楼，吉娜尾随而入，有张照片贴在楼梯口，上面的人是吉娜和她的父亲。她们的会面（如果这个女人真的存在的话）影片并没有正面描述，几分钟后，惊魂未定的吉娜驾驶她的红色切诺基离开，路上发生了车祸，和一辆车迎面撞上。受伤的吉娜搬去和男友 Stefan同住，但情况并没有好转，吉娜被没完没了的噩梦困扰，她开始怀疑男友Stefan并不是真的Stefan，而是某个复制的幽灵。所有的人都把吉娜这种奇怪的想法归咎于车祸带来的脑损伤。但吉娜的恐惧并没有停止，接下来的每分钟，导演西恩·埃利斯不仅让吉娜也让每一个观众分分秒秒都处于恐惧和不安之中。画面中经常出现镜子或其他光面的物体，似乎在隐喻最大的恐惧来源于自身。
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