成人快手

MI5 is in crisis.

Agent Tom Quinn has disappeared, having shot his superior Harry Pearce. Tom also stands accused of assassinating the Chief of The Defence Staff [see Series 2, Episode 10].

Could this be the perfect opportunity for conspirators in the darker corners of Government to overhaul the organisation? Or is there still time for Tom to be proved innocent?

Oliver Mace is chairman of the Joint Intelligence Committee. When he hears of Tom's actions, he seizes the opportunity to take control of Britain's homeland Intelligence Service. But what are his true motives? With the Prime Minister's backing Mace launches an investigation into MI5. Mace claims that MI5 is 'rotten to the core'. Can he succeed in depriving the organisation of its independence? Or will a familiar face from the past save the day?

Danny, Zoe and the rest of the team, under intense watch, manage to skip surveillance and meet to discuss what to do. They must inform Harry, who is appalled to learn of this "conspiracy, in the darker corners of Government" and their crass intention to "modernise the intelligence services".

Harry's contacted by Tom Quinn. Tom's been living undercover as a homeless man since he was last seen wading into the sea. Tom tells Harry that MI5's only hope of survival is to prove that Tom was innocent. A few hours later the body of the man, Herman Joyce, who Tom claimed set him up in revenge turns up on the steps of Thames House - Tom has murdered him but is this proof enough that Tom was innocent?

Mace doesn't think so. So the battle for control continues. Tom, Zoe and new recruit Adam entice Herman's wife, yet to know her husband is dead, into coming over to the UK. Despite Mace's attempts to throw them off the scent of Carmen, they track her down to a flat. She's in on the revenge plot against Tom - but realising Herman's dead, she shoots herself. No matter as the team have recorded her every word. Tom is in the clear and back at MI5. But so is Mace...