Alrick Riley

High-level secrets are stolen when Calum is mugged outside Thames House. Also available on Amazon Instant Video

Ghosts from the past come back to haunt MI5 chief Harry Pearce. Also available on Amazon Instant Video

With India and Pakistan on the brink of war, emergency talks are set up in an exclusive London hotel. Section D faces its biggest challenge yet, as the team tries to avert the first nuclear confrontation since World War II. Also available on Amazon Instant Video

Section D is caught on the back foot when two CIA agents are found dead. As the team tries to make sense of the murders, more officers are killed. MI-5 is placed on high alert, but Ros insists on putting herself in the firing line. Also available on Amazon Instant Video