A terrorist escapes custody during a prisoner handover when the convoy he is being transported in is attacked, leading to a CIA operative being killed and relations becoming frayed between British and American intelligence agencies. MI5 officer Will Holloway must team up with disgraced intelligence chief Harry Pearce to track him down before an imminent terrorist attack on London. Spy thriller, starring Kit Harington and Peter Firth.

During a handover to the head of counter-terrorism of MI5, Harry Pearce, a terrorist escapes custody. When Harry disappears soon after, his protégé is tasked with finding out what happened as an impending attack on London looms, and eventually uncovers a deadly conspiracy.