阿豪、阿坤两兄弟与家人从越南偷渡来港，途中阿坤妻子中枪身亡。抵港后数年，阿豪与阿坤均投入警界，而阿豪担任谈判专家一职，屡建奇功，乃获上司赏识。 　　香港犯罪集团请大圈仔徐七等人来港抢劫，为阿豪等人追捕，最后结果只得徐七和大象保住性命。徐七怀恨在心，俘掳阿豪妻，强暴泄愤，阿豪妻后来羞愤自杀，而阿坤遇害，阿豪捉着犯罪集团首脑痛脚，要胁交出徐七。阿豪解决徐七后，才晓得幕后主脑竟是其上司，阿豪十分悲愤，在众目睽睽之下把其上司杀掉。

A gang of chinese criminals migrate to Hong Kong in search of easy pickings. After pulling a few jobs and killing of a couple of cops, they turn their sight on Tse Sui Luen Jewelry Company. But the robbery is miserably botched. Some of the crooks are tricked and killed by police super sleuth, Detective Yuen Shiu. The criminal boss vows vengeance on Yuen and his family.