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　　王振扬即将上任成为香港警务处长，而他的上任势必会给香港龙蛇混杂的黑道以重大打击。侯家是香港最大的黑帮，其话事人侯文华（魏骏杰 饰）扬言会在一个月之内让王振扬知道他们的厉害，重振黑道雄风，警方派出情报科高级督察黄家辉（郑嘉颖 饰），命其不顾一切保护王振扬的安全。
　　侯文华联手泰国毒枭企图垄断东南亚毒品市场，他们的阴谋被女警丽塔（施莉达 Sririta Jensen 饰）识破，经过调查，这一切犯罪行动和富商郑坤有着撇不清的关系。西九龙重案组队长冯志伟（方中信 饰）邂逅了名为彭惠（蒙嘉慧 饰）的女子，后者实为侯文华的心爱之人。在侯文华的精心设计之下，冯志伟蒙上了杀警的不白之冤，与此同时，冯志伟亦发现在警局之中存在着黑帮卧底。

　　讲述了三个命运交织的人物：
　　Naksit——遭构陷贪污的政客，被迫遁入丛林部落避世；
　　Phawanee——刚从法国名校毕业的教师，秉持正义揭发担任镇长的叔父与私立学校的黑幕；
　　Siwa——人前圣商、人后行贿的伪善企业家。
　　当Phawanee目睹愈演愈烈的腐败现象，这位倔强的女教师毅然踏上对抗社会不公的险途。屡战屡败却愈挫愈勇的她，最终说服隐匿山林的Naksit重出江湖，两人携手向盘根错节的利益集团宣战……

 Season 5 finds Murder, She Wrote's intrepid Jessica Fletcher in fine sleuthing form, and venturing farther afield from Cabot Cove--a good thing, since at the rate the murders have been happening, that town would be nearly cleaned out. Some of the best episodes take place in more exotic locales like New York (dead man on the street, wearing just one shoe), Montana (a publishing convention gone horribly wrong) and West Virginia (two whistle-blowers at a coal company found gruesomely murdered). Angela Lansbury sparkles with determination and bonhomie, hitting her stride and then some. Jessica's own life backstory is even filled out tantalizingly, especially in the episode "The Last Flight of the Dixie Damsel," in which an investigation is launched into a mysterious cargo plane that is linked, she learns to her horror, to her late husband. The series' other delight is watching for cameos by stars of a certain age, and this season doesn't disappoint, with appearances by Roddy McDowall, Shelley Fabares, and Dinah Shore--but also some up-and-comers like Megan Mullally (proof positive that the Will & Grace whine was a put-on) and future satirist Bill Maher.

　　受人尊敬的正义法官秦誉（张家辉 饰），为掩盖儿子交通肇事逃逸真相，不惜将自己拖入罪恶深渊，在法官职责与父亲身份间陷入两难，高级督察唐萱（胡杏儿 饰）在调查中发现端倪，逐步揭开案件背后隐藏的父爱牺牲与程序正义的冲突，一场关于父爱与正义的终极博弈就此展开。