出身香港社会最底层的丁小嘉（佘诗曼 饰）在考上警察后，又以卧底的身份重回鱼龙混杂的砵兰街，替CID督查康道行（欧瑞伟 饰）搜集情报。谁知在追查三合会头目游达富的犯罪事实过程中，道行意外遇害身亡。他在临死前为防止手下卧底人员身份暴露，而删除了包括小嘉在内等五名卧底的纪录。在此之后，道行的同袍刑事情报科总督察卓凯（苗侨伟 饰）联系到小嘉，希望其能协助找到其他四名卧底，并掌握外围赌博集团的犯罪证据。
100 years ago, the sisters Yod and Yard were the wives of Phra Wanathep. Yard was a loyal servant to madam Kamlai, his main wife. But Khun Thep asked Yod to help him get her sister and he would reward her. So Yod knocked her out and Wanathep raped her. Later, Yod tricks Yard into giving poison to Kamlai, to get rid of her and get Yard in trouble, so she can read morehave Khun Thep all to herself. So Yard unintentionally kills Kamlai and her 2 daughters. All the servants find out that Yard killed Kamlai so they hung her. Yod's mother finds out that she caused Yard's death so she stabbed Yod and put a curse on her, if she was to cause her mother to cry a tear again, she will never be able to get reborn.
大学辍学生迈克（帕特里克·J·亚当斯 Patrick J. Adams 饰），在一次贩毒失败后闯进了一个高材生云集的招聘会，原来这是曼哈顿最著名的律师哈维（盖布瑞·马赫特 Gabriel Macht 饰）在招聘律师助手。在众多哈佛高材生中，哈维看中了聪明机警、记忆力发达的迈克。尽管他发现迈克非但不是哈佛法学院学生，而且他还有吸大麻的恶习，但他还是决定瞒着上司，招迈克做助手。于是，哈维和迈克组成了一支“金装组合”，在律师事务所中成为常胜搭档。迈克虽然有着天才般的头脑，但在法律上他还是一名新手，加入事务所之后遇到了各种难题，而冷面律师哈维并没有对他处处提点，因此迈克总是四处碰壁，而哈维的对手路易更是处处刁难他……
故事描述一群大员市消防局同安分队的消防队员，在每次面临惊险的打火、救护与救援任务中看见人性与社会百态，透过他们执行的案件揭露许多消防职业不为人知的心酸故事。
