乔星（陈豪饰）、阎武（黎耀祥饰），一个是如日中天的神级杀手，一个是风光不再的潦倒杀手。两人却有着共同的敌人，联手复仇令他们结下不解之缘。 “杀手猎人”的出现却威胁著整个杀手界。杀手、清道夫、经理人悉数出手拆解危局。杀手界外的单亲妈妈向茜（李佳芯饰）、一楼一凤姐淑娴（江美仪饰），也因与乔星、阎武的感情被卷入危机……乔星为解决杀手猎人，竟导致阎武之女重伤昏迷。阎武为向女儿交代，必须杀乔星；乔星为了向茜，必须活下去。两代杀手之王，最终走向了没有退路的对决……
As Leo's replacement Thomas Chamberlain arrives Nikki investigates the murders of Rachel Freedman, shot in the head, and her little autistic son Nathan, who was poisoned. Nikki rejects policewoman Anne Burchett's theory that Rachel killed them both but is perturbed when an impostor, claiming to be Rachel's sister, visits the morgue. At the same time the disfigured corpse of Eva Liron is discovered, killed with the same poison as Nathan. She had been the nanny to French hot shot footballer Isaac Dreyfus and was planning to blackmail him over a sex tape of them both. Jewish Isaac is a controversial figure due to his anti-Muslim sentiments but he denies ant part in the murders. Then another victim, Isaac's agent Mousa, is discovered dead.
12月30日，無線電視新劇《食腦喪B》在香港將軍澳電視城舉行演員造型記者會，藝人江嘉敏、何廣沛及陳曉華出席為劇集宣傳。江嘉敏在劇中飾演紅斑狼瘡症患者，至於陳曉華飾演KOL，各自跟何廣沛都有感情線。何廣沛以喪屍造型現身，他稱自己暫時是劇中唯一喪屍。
格林和他的新搭档乔·丰塔纳调查了一名伊拉克战争老兵被谋杀一案，这名老兵有更多阿布·格莱布监狱的照片。一名伊拉克妇女是美国公民，她被指控，但她声称自己是一名战俘。
