刘德华、林威饰演的两兄弟在六二年的大逃亡潮时失散，威遭遣返大陆劳改，华获蛋家妹温碧霞救起，到港并结为夫妇。华从苦力做起，后来成为台湾养鱼业及船务的成功商人，而威则被犯罪集团雇用来港参加打劫，又被指使往台湾掳劫华之女儿，更错手杀死华女。华返港报仇，与威力拼，后来认出彼此是失散多年的兄弟……

After receiving a life imprisonment sentence for a NY Chinatown massacre, Jia Shi Lan, alias Hei Lan, obtains a pardon through the Mafia's influence. Returning to Hong Kong, Hei Lan attempts to use the stature and fortitude of Brother Han, an elder, but good-natured underworld boss, to gain power and spread the Mafia's influence throughout Southeast Asia. After a deadly double cross leaves many of Han's society dead, two former members, one a cop, the other a florist, and the sole remaining loyalist join forces to bring down the criminal empire of Hei Lan.

Hung and Ann are down-on-their luck prostitutes trapped in Hong Kong. Pauline's boyfriend, Sam, back in China, who is under the impression that she is away working at a factory, is double-crossed by Billy Chow, and while looking to escape, flees for Hong Kong and winds up at the Brothel where Pauline is employed. He is crushed when he finds out the truth, but by this point, everyone involved on all sides is too deeply involved to turn back.