《保镖》（Bodyguard）描述退伍老兵David Budd（Richard Madden）加入伦敦大都会警署王室与专家保护局，专门负责保护性格火爆的政治人物、英国内政大臣Julia Montague（Keeley Hawes）。到最后，保镖和保护对象成了水火不容的死敌。Sophie Rundle、Gina McKee、Rowena King和Vincent Franklin参与演出。

Over the last ten years, technology has transformed almost every aspect of our lives before we've had time to stop and question it. In every home; on every desk; in every palm - a plasma screen; a monitor; a smartphone - a black mirror of our 21st Century existence.

本集根据《波西米亚丑闻》改编。正当 莫里亚提和夏洛克处于生死相搏之时，莫里亚提的手机响了，他接到了一个神秘的电话，不得不放弃和 夏洛克的博弈，而电话的另一头，一个妖娆女人的手出现在画面中，她手上似乎掌握着莫里亚提十分想要的东西。

The quirky spin on Conan Doyle's iconic sleuth pitches him as a "high-functioning sociopath" in modern-day London. Assisting him in his investigations: Afghanistan War vet John Watson, who's introduced to Holmes by a mutual acquaintance.