在这部义盖云天喜剧/爱情片中,港生（王祖贤 饰）从大陆偷渡至香港，一路颠簸还被蛇头欺辱，搏斗过程中将蛇头打伤才逃脱出来，但外面的世界同样令她感到陌生惶恐。她起初预备投靠自己的姨妈，却遭到姨妈拒绝且冷言讽刺港生，而姨父则垂涎其美色，港生只得离开姨妈家再次流落街头。督查何定邦（周润发 饰）和祥仁（吕方 饰）追捕白粉雄，白粉雄驾车冲出街道撞倒了路边的港生。港生在医院苏醒以后害怕身份败露被送回大陆，灵机一动谎称自己脑部受伤得了失忆症，还“认准”何定邦就是其丈夫伟雄。心性善良的定邦只得将港生接回家中暂住，二人关系日渐改变，但港生“偷渡客”的身份却像两人关系中的定时炸弹时时刻刻存在着……

After a botched attempt to nab a drug smuggler in a parking garage, police detectives Ho Ting-Bon (Yun-Fat Chow) and Cheong Yan (Fong Liu) accidentally cause a runaway car to hit a young woman, Kwong Sun (Joey Wang), who is in the city illegally. Sun then fakes amnesia in order to protect her illegal identity, and is put-up for several nights by Bon. While Sun struggles to find her identity papers in Hong Kong and relatives to take her in, Bon feels compelled to let her stay in his home. However, Sun can only fake her amnesia for so long.

败也那段儿，成也那段儿。当初的小美好一去无踪影。一部反派角色得逞的电影。我在胡扯。来之不易的，怎么能轻易放弃——理解和包容。李香琴贡献了一个最受欢迎喜爱温暖三观正的好婆婆。《义盖云天》片名不搭啊 。。。还是叫《情义千秋》吧。。。。关于强奸戏。恶趣味。有点小感动。