af is undercover with a group of Al Qaeda terrorists who plan on exploding a thermobaric bomb in central London. Adam's solution is to buy the bomb before the terrorists do and thereby protect Operation Waterfall, a plan to recruit would be terrorists to their side and the main purpose of Zaf's assignment. Ros Myers has joined Adam's team but is anything but friendly. MI-5 targets Iain Kallis as the man they'll buy the bomb from while they recruit one of the terrorists' former girlfriend in an attempt to turn him. Meanwhile, Harry Pearce surprises Ruth when he asks her out for dinner. She's not too pleased however when everyone in the office seems to know their business.

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