"MI-5" is a gripping British espionage drama that continues to deliver shocking twists and turns in its third season. Tom Quinn, played by Matthew Macfayden, disappears after being shot, and Adam Carter, portrayed by Rupert Penry-Jones, steps up to take his place in Section B. After recovering from his injury, Harry (played by Peter Firth), tasks Adam with proving Tom's innocence. Later in the season, Danny (played by David Oyelowo) and Zoe (played by Keeley Hawes) are sent on a mission that has tragic consequences for one of them.