第二季第一集承接上一季最后一集的剧情，从被炸弹和狙击枪威胁的夏洛克(本尼迪克特·康伯巴奇 Benedict Cumberbatch 饰)和华生（马丁·弗瑞曼 Martin Freeman 饰）和莫里亚蒂(安德鲁·斯科特 Andrew Scott 饰)第一次正式会面开始。 接着夏洛克在接受白金汉宫一份重要委托的案件中遇到了亦正亦邪的神秘女子艾琳·艾德勒(拉娜·普尔弗 Lara Pulver 饰)，一位旗鼓相当的对手，一个使他心动的女子。这一次莫里亚蒂使大众相信夏洛克所有的事迹全是虚构，使之变成一个伪英雄名誉扫地。而为了彻底打垮夏洛克迫使他跳楼，莫里亚蒂竟立刻吞枪自杀，结局到底如何，夏洛克会因此中了他的圈套吗？精彩尽在第二季。
Opens with the lovely Pin dreaming about great sex with a bloke whom she soon meets in real life – he’s a security guard at her apartment block. There’s also a group of voyeur cops and their captain Fatty Pang who is always losing on the racehorses. Fatty spies on Pin in the shower one day and steals her red underwear. Pin keeps having lustful fantasies and sometimes has sex wi...
When his long suffering girlfriend disappears suddenly, leaving a cryptic note as her only explanation, Hank's comfortable life and his sanity begin to crack. Then, from the woods surrounding his house, something terrible starts trying to break in.
这座城市出现了一名绰号“Blitz”的连环杀人魔，他神出鬼没地杀害多名警官，而他的凶器只是一把锤子。没人知道他的踪迹，而他也因作案手法老练而使警方难以破案。嚣张的他更在每次作案前后都会和某报社负责犯罪版块的编辑邓洛浦（大卫·莫瑞瑟 David Morrissey 饰）报告杀人的细节，从而追求社会的关注。邓洛浦为了自己出名而没有通知警方，每次都能让警方试图封锁消息的计划破灭，也因此被警方注意。