Mark哥(周润发 饰)和志民(梁家辉 饰)是堂兄弟,两人是越南华侨,现正在香港发展。岂料越战打响,两人都十分担心仍然居住在越南西贡的志民的父亲松叔的安危,为了凑足钱将志民父亲接到香港,两人决定帮当地黑帮走私军火到越南。岂料他们在越南遭到了丧邦的伏击,关键时刻幸亏香港黑帮老大的女友英杰(梅艳芳 饰)及时相救,两人才幸免于难。逃过一劫的三人在西贡渡过了一段快乐时光后,英杰辞别了两人。随后Mark哥和志民将松叔顺利接回了香港。回港后,两人过着安稳平静的生活,只是一直都没有打听到恩人英杰的消息。突然有一天,英杰出现了,重逢令三人都十分开心。只是,一场祸事也在悄悄逼近……At the end of the Vietnam war, Cheung goes to Saigon, intent on bringing his uncle and cousin back to Hong Kong. In Saigon, Cheung meets beautiful gangleader Chow, and relies on her help for their safe return. A love triangle develops between the cousins and Chow Further complicating matters, Chow's lover Ho, a gang leader, appears Ho deports the cousins, and kills their uncle. Cheung and his cousin return to Vietnam seeking revenge, while Chow and Ho also become entangled with a local vietnamese warlord. Chow tries to stop the battle, but the warlord kills Chow and Ho. Just before her death Chow gives the cousins the last two air tickets with which to leave Vietnam