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Danny, on Close Quarter Protection, is shaken when his charge is shot at. The charge: Zuli, a controversial writer living in Britain under a fatwa. Zuli survives but immediately sacks MI5, appalled at how they - especially Danny - could have allowed this to happen.

On closer examination Adam picks up on something crucial - the hitman missed his target, but almost hit the innocent Harakat, bookseller and friend to Zuli. Surely a professional hitman wouldn't make such an error? Following through his hunch, Adam tasks an unconvinced Danny to put Close Quarter Protection on Harakat.

The team track down the hitman to a house in East London. They watch and wait, but nothing. He doesn't move an inch. Ruth uncovers the application for UK citizenship Harakat filled in 20 years ago - it reads like a bad legend and the team are immediately suspicious. Harry goes to see his MI6 colleague, the shady Oliver Mace. Mace denies any dodgy dealings, but Harry is irresolute. Meanwhile, Zoe is forging a relationship with Will, the photographer - to Danny's slight consternation.

The team receive a photograph from an anonymous source - it's Mace talking to the head of a Pakistani terror group a couple of years ago. MI5 are worried. Why were they meeting? Harry puts Adam in touch with a source who will shed some light on the photo. But it's vital the identity of the source is kept secret. The team launch an elaborate surveillance detection route in the hope Adam will make it to the meet without being followed. Mace, desperate to stop Adam talking to the source, does his best to outsmart MI5 - but he's no match for Adam.

Adam, unfollowed, meets the source and she's a senior government official. She reveals that Harakat is in fact a double agent, working for both Pakistan and MI6. The situation is now too hot and MI6 have cut a deal to allow him to be 'removed'. The hitman they are watching is only a decoy. The real one is out there now. Can the team get to Danny and Harakat before the hitman? But Danny, who has forged a deep friendship with his charge, is out of contact. Adam races on foot to get to him - but it is too late - the hitman has got there first and much to Danny's horror, Harakat is shot dead in front of him. Mace is unrepentant - as he tells Harry, post 9/11, no-one is off limits.