This series starts strong with a griping opening sequence that will propel you into the story. The narrative adeptly builds tension and suspense while delivering intense action sequences. Richard Madden is great as the title character, as he juggles his high-security job and PTSD disorder while attempting to cling to his failing marriage. Sophie Rundle is delightful in her role as Madden's wife. Unfortunately, the script fails to explain in detail why their marriage is in trouble, which makes the marital conflict seem forced. The scene-stealer is Keeley Hawes, who is fantastic as the Home Secretary in need of a government security detail. Her character is so strong and important to the narrative that the series feels like it's about her, which makes the resolution of the series anticlimactic.