Informer is a sophisticated, character-driven thriller about Raza, a young, second generation Pakistani man from East London (Nabhaan Rizwan) who is coerced by Gabe, a Counter-Terrorism officer (Paddy Considine) to go undercover and inform for him. Gabe, who has a past he is unwilling to expose, is joined by Holly, his new and ambitious partner (Bel Powley) whose endless curiosity becomes threatening to him. As the central counterterrorism investigation heats up, the stakes for all three get higher and higher. Informer tells a story about identity in a world where lines are increasingly being drawn and sides are being taken. What happens when you, or your friends, family or neighbours fall on the wrong side of that line and the personal becomes political?

In season one we are introduced to the local community through the eyes of young nurse Jenny Lee as she lives and works as a midwife alongside the Nuns of the Order of St. Raymond of Nonnatus in the deprived Poplar district of London's desperately poor East End in the 1950s.

一个受保护的证人在转移途中遭伏击，三名在场警察被杀害，负责这次转移的探长Lindsay Denton很快被怀疑串通罪犯，反贪组在调查Denton的同时，也在寻找真凶，但是事情似乎并不简单……

《9号秘事》这部以反转著称的英剧是《疯城记》主创史蒂夫·佩姆伯顿与瑞斯·希尔史密斯的最新作品，自开播之后广受剧迷追捧。在接受英媒采访时，佩姆伯顿透露第三季是“特别黑暗的一季，其中有两三集我们将恐怖惊悚元素推向了新高度。”这一季依然会由六个独立故事组成，故事发生的位置总与9号有关，一座1978年的阿尔卑斯山小木屋、一家关门之后的餐馆、一间艺术馆和一个KTV包房成为第三季上演好戏的舞台。