Determined to push the investigation forward, David targets Julia's enemies. As he looks into the home secretary's political manoeuvring, he finds his fears about a conspiracy at the heart of government look increasingly plausible. However, concerns are raised surrounding his psychological health as allegations about his professional conduct come to light and the finger of blame is suddenly pointed at him. The penultimate episode of the thriller, written by Line of Duty's Jed Mercurio and starring Richard Madden.