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……
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