Drama series about the British Security Service. With Lucas back within MI5 he reveals that the Russians interrogated him about Operation Sugar Horse, the most secret ongoing spy operation MI5 ever had. If the Russians know about it, then MI5 has a very high level mole. Harry seeks out his mentor, The Spycatcher, to help him find the mole.
Ben is undercover with an Al Qaeda cell; they are planning to bomb London and what looks like a dry run unexpectedly turns live.
|Harry Pearce||Peter Firth|
|Ros Myers||Hermione Norris|
|Jo Portman||Miranda Raison|
|Malcolm Wynn-Jones||Hugh Simon|
|Bob Hogan||Matthew Marsh|
|Lucas North||Richard Armitage|
|Connie James||Gemma Jones|
|Ben Kaplan||Alex Lanipekun|