故事改编自安德鲁·莱恩的同名畅销小说，讲述年少生涩的夏洛克·福尔摩斯卷入一起牛津大学的谋杀疑案，他的自由因此受到威胁，这也是他人生第一桩案件。目无纪律的夏洛克因此要去拆解一起涉及全球的阴谋，也将永远改变他的人生。

 新一季将延续第二季的故事，自Rachel Carey（荷丽黛·格兰杰 饰）在全国直播中揭露一段伪造的政府部长视频、暴露情报机构秘密操作项目“修正”以来，已过去一年。在对“修正”计划非法使用的调查期间，Carey成为SO15反恐指挥部的代理负责人，试图通过全新的“真相行动”摄像系统重建公众对监控技术的信任。然而，一场精心策划、极其残忍的恐怖袭击突然爆发，直击英国权力核心，仅留下一位目击者。随着Carey深入调查，她被卷入一场不断扩大的地缘政治危机之中，这场危机渗透至英国政坛、安全机构乃至媒体界。一场巨大的阴谋正悄然展开，但幕后黑手究竟是谁？

 Production details for Crookhaven, the upcoming television adaptation of J.J. Arcanjo’s The School for Thieves series, are currently being kept under wraps.

Adapted from Tom Bradby’s tense, topical novel of the same title, Secret Service, is a suspenseful, fresh-from-the-headlines story deeply rooted in today’s political landscape. It delves into the long-standing tensions between Russia and the UK, and asks how far can Russian interference in British politics really go? Secret Service follows senior MI6 officer, Kate Henderson, whose life must seem pretty ordinary to those who don’t know her well, as she’s happily married with two teenagers and a job in the civil service. However, Kate’s real job is heading up the Russia Desk of the Secret Intelligence Service. When her undercover operations reveal alarming evidence that a senior UK politician is possibly a high-level Russian asset, Kate is in a race against time to uncover their identity. Then a young woman is brutally murdered, throwing Kate and her team into the spotlight. With blood on her hands, her reputation to uphold, her family hanging by a thread, and an election looming, Kate is quickly running out of options and the clock is ticking….