得一笔奖学金资助,张一鹏(刘德华)获得去法国留学深造的机会,学成归国后,他被任命为上海市禁烟(鸦片)行动的第一专员。 张在法经西方文化与价值观熏陶,十分书生意气,刚携妻子(陈少霞)来到上海,便展开一系列动作,不知中国与西方国家国情有别,难有健全的法律体系及社会秩序:警察署长倪坤(顾宝明)和大毒枭戴济民(刘松仁)是拜把兄弟,两人一起控制着包括贩卖鸦片在内的上海所有的非法交易,见数次向张行贿无果,他们发毒誓要让张生不如死。In much the same vein as "The Untouchables", Andy Lau stars as a Cantonese detective out to combat opium sellers. Encountering high-level corruption along with close friends being murdered, Lau sets out to stop the dealers.