方丽娟（杨千嬅饰）一直想成为一名警察，几经失败才考近了警校。虽然她在警校中刻苦学习，可是她天生并不是当警察的料，成绩不理想以外还常常笑料百出。毕业后，被调配到失物认领处工作，令她心里很不是滋味。 刚好重案组在计划一宗缉拿黑帮的案子中需要一名生面孔的卧底，丽娟误打误撞被任命执行这次的任务。行动的过程中，她与黑帮老大区海文（吴彦祖饰）结缘，刚开始海文觉得丽娟的身世可怜，打算给予帮助。谁料两人后来互生爱意，阿祖百般体贴，令方丽娟觉得左右为难，没想到自己假戏真做了，方丽娟最后选择了什么样的决定呢？
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