Carey develops a theory as answers begin to reveal themselves, and Shaun finds himself trusting an enigmatic stranger who promises to lead him to the truth.
The stakes intensify for Shaun when he comes face to face with inscrutable CIA agent Frank Napier, whilst Carey’s investigation appears to hit rock bottom.
After key evidence is mysteriously redacted from her investigation, Carey is forced to find other ways of pursuing Shaun, who is searching for answers of his own.
After a Pakistani intelligence officer is murdered in south London, the head of the Pakistani intelligence service talks to Harry and Ros. They learn that there is a planned attack…
