Maise（陈慧琳 饰）与男友高桥裕二（仲村亨 饰）相恋多时，高桥却在结婚当天突然失踪了。Maise决定前往东京寻找高桥，同时装修师父毕大勇（郑伊健 饰）为了追逃Maise欠下的装修费用，便决定跟着她前往东京。互相不信任的二人到了高桥在东京的家，遇到了一直跟踪高桥的私家侦探林贵仁（梁朝伟 饰），原来高桥与黑帮伊藤（阿部宽 饰）的妻子有奸情，于是失踪了。三人最后联手起来，决定一定要找到失踪的高桥，与黑帮抗争。随着追踪的层层深入，Maise也知道了高桥、毕大勇还有林贵仁的真实身份。Is anyone who he says he is in this caper that moves from Hong Kong and Las Vegas to Tokyo? Ken doesn't show up in Vegas for his wedding; his disconsolate bride, Macy, heads home for Hong Kong and finds John, an interior decorator, waiving a check of Ken's that has bounced. She leaves immediately for Tokyo to find her businessman boyfriend, and John tags along. Ken's flat is teeming with members of the Ito gang, who are also looking for Ken. John and Macy escape, with the help of a crew of look-alike cuties who work for Lin, who claims to be a private investigator. He too is looking for Ken. Where is Ken, why has he disappeared, and who will find him first?