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Ellie starts to doubt whether she can cope with dating a spy. Tom's mentor is working undercover, but his methods start to appear dangerously unconventional. Meanwhile Zoe discovers Tessa is up to something.

Storming the State Consulate of Turkey leaves Tom wounded and his girlfriend, Ellie, unable to accept any more of his lies. Tom is forced to reveal his real role to her and Maisie, but at work a more serious situation appears to be gathering momentum.

Anti-Bush and anti-globalisation rallies are planned in London and Danny and Zoe are sent to observe. Things become confused when they recognise a top MI5 officer, who appears to be undercover, but whom they werenÂ’t told would be on the operation. Peter Salter, however, is a respected officer, so Zoe makes the decision to let him go.

With Tom being SalterÂ’s official confidante, Zoe calls him in. Harry admits to Tom that Salter is on a joint secret operation between MI5 and 6, in an effort to catch Istvan Vogel, the leader of an extreme anarchist group. MI6 suspect Vogel of planning to disrupt President BushÂ’s imminent visit to the UK.

As Tom struggles to remain calm with the exasperating Jools Siviter of MI6, an increasingly tangled web yields unexpected news: Salter has fallen for one of VogelÂ’s followers, Andrea.

A showdown sees Tom order Salter off the case, but Salter flees. Unsure now whose side he is on, Tom and his team try desperately to find him. Things become further muddied when Harry, keen to regain control, commands Tessa contact one of her covert agents who, it’s thought, is undercover with a related anarchist group. Zoe goes to meet the agent, only to find Tessa waiting. The corrupt Tessa has been running phantom agents and pocketing their pay. She hands Zoe £10,000, in return for her silence.

Whilst MI5 search for him, Salter, Andrea and other members of VogelÂ’s group break into a university campus, where Salter hacks into a computer. Security catches them in the act and, although the others escape, Salter is caught and hauled back to Harry and Siviter. Tom uses all the tricks he learnt from Salter, and gets him to admit to betrayal but beyond this obvious admission, the secret services are still in the dark - and BushÂ’s visit is getting closer. What was he doing in the university? Before Tom can attempt further interrogation, Salter takes his own life and keeps his secret to himself.

Later that night, Danny suddenly realises what SalterÂ’s computer hacking means, he's been tampering with the Air Traffic Control system. However, Danny is a quick thinker and his intervention, results in the President's plane being diverted to Paris.