DCI Gill Murray, DC Janet Scott, DC Rachel Bailey find themselves working alongside the formidable DCI Julie Dodson when two badly burned bodies are found in remote woodland.

洛杉矶警署重案组的警探们还沉浸在Brenda Leigh Johnson被调走，新队长Raydor上任的震惊中不能自拔。与他们的原上司不同，Raydor决心以一种更加以团队利益为第一的方式领导大家，她将自己得到的所有赞扬都与工作伙伴们分享。但是，鉴于Raydor曾经对这个组的警探们和他们的原上司进行过内部调查的“不良记录”，如何博得警探们的信任和信心是Raydor现在所面对的最严峻的问题。尤其难缠的是Provenza，只要认为对方不如他知道的多，他便不会听从命令。by:yakubd.cc

D.C. Rachel Bailey在辛迪加即曼彻斯特谋杀专案组工作9号工作。 　　工作时她是个优秀的警察，但是处理工作以外的事情她就玩不转了。我们看到她时，男友Nick Savage吃饭时当众把她甩了。男友说他要离开。Rachel狠揍了Nick两下，但是看得出她确实内心伤的很深，尤其是当她怀疑Nick有外遇的时候。Bailey最好的朋友Janet Scott当时也在那里，一如既往的在第二天全力投入到工作中。

Janet is promoted to sergeant but steps down to give it to Rachel as she feels she is needed more at home. The pair join the search for eighteen year old Robin McKendrick, a simple lad reported missing by his boss, landlord John Rivington. Pub regulars are unforthcoming until a boy called John tells Janet that an ex-soldier known as Jackie-Boy locked Robin in his car boot as a cruel prank. He later reported the car as stolen. Another witness claims that Jackie- Boy dumped his car in a quarry with Robin still in the boot. In the process of the investigation Gill identifies another body found in the river, that of Mandy Sweeting, who disappeared two decades ago.

"With DCI Gill Murray in retirement, ever-ambitious Rachel (Suranne Jones) returns from her Vice secondment fired up and full of new ideas and initiatives. She’s gained valuable experience and really wants to make her mark as she returns to Syndicate 9’s Murder Squad. 　　Exhilarated to step up to the plate, Rachel is exactly who Janet (Lesley Sharp) and the Squad need to move forward with a terrifying and sinister Internet crime investigation of epic scale and unrelenting horror. Using her Vice authorisation, Rachel accesses a disturbing world where people brag about committing murder and lay down the gauntlet for the next victim. A game of ruthless life or death daring develops, as Scott & Bailey investigate multiple killers with horrifying and everlasting consequences. They will be changed forever and the investigation will take a devastating toll on their private, professional and personal lives." 　　The drama will be executive produced by Nicola Shindler (Happy Valley, Last Tango in Halifax, Banana, Cucumber) founder of the Red Production Company and produced by Michaela Eccleston, Red’s Head of Production. 　　Suranne Jones, who conceived the idea for the drama with fellow actress Sally Lindsay, will also executive produce alongside Nicola. Sally Lindsay also returns to the drama playing Rachel’s sister Alison. 　　5-1 Rachel steps up to acting DI on a case that becomes more sinister than it first appeared.

服务警界多年的探长洪爷（郑则仕），却因个性不羁，办事不依法则，未为上司赏识。随后，结识舞女嘉嘉（伍咏薇），触发了一段不可收拾的孽恋，并倾力替她还债，不料被洪妻发现，一怒之下将洪爷毕生积蓄拿走。从此，洪爷深受打击，且饱受同僚蹊落，同时面临失去嘉嘉，在多方面压力下，决与贼匪勾结，合谋诈骗富商巨款。 　　警方了解事态严重，遂派陈帮办（成龙）负责追查，惜无甚进展，与众手下相处难以融洽，大受精神困扰，惟有向心理医生Clarissa（潘玲玲）求助；除帮助他解除种种精神压力外，也逐渐改变其处事态度，并赢得众手足的信任，两人更情愫渐生。　　在中、港、台警方的通力合作下，终将洪爷围捕；陈帮办更拼命缉捕疑犯，经过双方斗智又斗力后，洪爷强行突围，惜在身负重伤下与嘉嘉同时丧生。事后，陈帮办既立了大功，亦得到患难知己Clarissa欣然答允，成了他的终身伴侣。

服务警界多年的探长洪爷（郑则仕），却因个性不羁，办事不依法则，未为上司赏识。随后，结识舞女嘉嘉（伍咏薇），触发了一段不可收拾的孽恋，并倾力替她还债，不料被洪妻发现，一怒之下将洪爷毕生积蓄拿走。从此，洪爷深受打击，且饱受同僚蹊落，同时面临失去嘉嘉，在多方面压力下，决与贼匪勾结，合谋诈骗富商巨款。 　　警方了解事态严重，遂派陈帮办（成龙）负责追查，惜无甚进展，与众手下相处难以融洽，大受精神困扰，惟有向心理医生Clarissa（潘玲玲）求助；除帮助他解除种种精神压力外，也逐渐改变其处事态度，并赢得众手足的信任，两人更情愫渐生。　　在中、港、台警方的通力合作下，终将洪爷围捕；陈帮办更拼命缉捕疑犯，经过双方斗智又斗力后，洪爷强行突围，惜在身负重伤下与嘉嘉同时丧生。事后，陈帮办既立了大功，亦得到患难知己Clarissa欣然答允，成了他的终身伴侣。

《重案组》作为《罪案终结者》的衍生剧，将接收不少原剧卡司并展开新故事：两次获得奥斯卡提名的玛丽·麦克唐纳(Mary McDonnell)将作为新女主Capt. Sharon Raydor 领衔。剧集将探讨警察和检察官是如何确保案件成立、证据可靠并使得罪犯认罪这一过程。