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An Iranian arms courier in London has procured a circuit board that will finally enable Iran's nuclear warheads. In order to prevent the boards reaching Tehran, Harry orders all planes grounded.
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But with Ros' bugs in place on the Grid, word of this plan leaks fast and MI5 receives a threat that a lethal chemical will be released into London's water supply unless the courier is able to reach Tehran. Harry orders a security sweep on the Grid as Ros desperately attempts to dispose of the bugs.
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Armed with further intelligence that the courier is British, the team manage to establish which plane he is on. Adam and Ros both board undercover - Adam as a passenger and Ros an air stewardess.
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Meanwhile, Jo and Malcolm find the source of the poisoned water supply and must find a way to prevent the release of the chemical, without the terrorists learning that their threat has been foiled.
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As the plane draws nearer to Iranian airspace, tension mounts - Adam and Ros must identify the courier from the passenger list, or ground the plan, before it enters Iran. Adam accidentally kills a man from the CIA he's convinced is the courier. He's quickly detained by Iranian police and soon discovers the pilot's the culprit.
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Adam and Ros are too late in acquiring the circuit boards that will give Iran instant nuclear capability.
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