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这个奇异的故事发生在一个平凡的男人身上。他性格有些孤僻，与朋友鲜少交流。某天，他的鼻子突然学会说广东话，男人为之起名阿鼻。自从阿鼻会说话后，男人再也没跟朋友联系过。阿鼻就像一个贴心的好朋友，“两人”亲密无间，无话不说。某天，男人发现阿鼻离面部远了一点儿，询问后才得知，一旦阿鼻接收到负能量，它就开始变长。男人埋怨阿鼻不事先告知，可又无能为力。他们的相处依然和谐，只不过“两人”的话越来越少了，彼此贴近，但心与心的距离越来越远。直到某天，阿鼻终于决定离开，去未知的地方远行……

某天深夜，博爱医院的内科医生辛玉廷（马崇乐）和画匠老方救下一名被日本宪兵队追捕的伤员后，另一名医生周益（雷明）向外挂了一通神秘电话。不久，日本宪兵队特高课青木（袁春海）收到号称“帝国军人眼睛”的“四十五号”提供的情报，下令搜查博爱医院，翻译官丁彦（郭法曾）首当其冲搜查时，扑了空。“四十五号”现身日本宪兵队，称周益就是要找的新四军的买药人，原来他是……知晓药品交易的时间和地点后，青木再派丁彦出发，殊不知丁彦同“四十五号”的身份并无差别。

警界老油条阿辉（周润发 饰）生性风流，凭借自己父亲昔日手下沾叔（黄沾 饰）的维护，阿辉在警局虽然得不到升迁，但也落得清闲。新进警员曹里昂（李元霸 饰）的到来打破了这一切，曹大胆甚至莽撞的办案方式连累阿辉大出洋相，阿辉虽恨曹里昂，但碍于上司命令，不得不与曹搭档。与此同时，毒枭罗茂森（徐少强 饰）的手下毒蛇炳将其交易的毒品调包私自出售，毒蛇炳之妹当娜（利智 饰）配合售毒。兄妹二人非法入港相依为命，希望藉由毒品生意改善生活。罗茂森团伙杀人引起警方注意，阿辉与曹里昂两人接手此案，他们很快从当娜身上得到了线索。而罗茂森亦发现毒蛇炳偷梁换柱的所为，一时间阿辉与罗茂森展开了对当娜的争夺……

An affluent medical professor, Komiya, and his bossy wife, Tokio, are to look after Setsuko, their high-spirited niece from Osaka. Setsuko is a liberated woman who does what she wants, including smoking, even though she is a minor. On Saturday, the professor does not feel like going to his weekend golf game, but his wife packs him off anyway. So he leaves his bag at the apartment of his student Okada, and goes to a bar with a friend. Setsuko traces him there, and insists that he take her to a geisha house. When she gets rather tipsy, the professor calls Okada to take her home, while he sleeps at Okada's. The wife becomes suspicious of Setsuko when she sees Okada bringing her home, and also of her husband when she discovers that he did not go golfing.