老实巴交的小伙子斯莱文（乔什•哈奈特 Josh Hartnett 饰）带着好朋友尼克对他的承诺来到了世界金融中心纽约讨生活。尼克曾承诺只要斯莱文来纽约闯天下，他将提供一切的帮助。然而，当斯莱文按照尼克提供的地址找到尼克住所时，却发现尼克已经不知所踪。身无分文又无家可归的 斯莱文只好暂时住在尼克的空房子里。大麻烦降临到斯莱文的头上！原来纽约的两伙黑帮都在竭力寻找尼克，原因尼克知道一次“黑吃黑”事件的真相。这下他们都把住在尼克家的斯莱文当成了尼克！ 　　一时，斯莱文百口莫辨，陷入了黑帮混战中。最后，“幸运”的斯莱文能否化险为夷？A case of mistaken identity lands Slevin into the middle of a war being plotted by two of the city's most rival crime bosses: The Rabbi and The Boss. Slevin is under constant surveillance by relentless Detective Brikowski as well as the infamous assassin Goodkat and finds himself having to hatch his own ingenious plot to get them before they get him.