马修（乔什•哈奈特 饰）是个年轻有为的广告公司人员，与女友也到了谈婚论嫁的阶段。当他在一次生意洽谈的会晤中，他无意间听到了往日挚爱——莉萨（黛安•克鲁格 饰）的声音。那时两人正处热恋，可是莉萨无端在他的生活中消失了。而一直以来，马修都无法忘记莉萨。 　　他正怀疑那名女子正是莉萨，他决定要留下来寻找这名女子，因为他在电话亭里发现了女子的住址。 　　马修进入了女子的寓所，她发现了一切属于莉萨的特征，可是出现的却是另一个人，另一个叫莉萨（萝丝•拜恩 饰）的女人。马修依然不停止寻找真正爱人的脚步，但他不知道的是他早已进入了一个圈套内……Matthew, a young advertising executive in Chicago, puts his life and a business trip to China on hold when he thinks he sees Lisa, the love of his life who walked out on him without a word two years earlier, walking out of a restaurant one day. With a little help from his friend Luke, Matthew obsessively and relentlessly tracks Lisa down and while doing so, runs into another young woman calling herself Lisa whom, unknown to Matthew, is an actress named Alex and may hold the key to Lisa's disappearance, and discovery.