Top MI5 agent Eddie Macintyre and his team are tailing a terrorist cell in Glasgow when a van carrying al-Qaeda activists on a dummy-run explodes in the city-centre, causing mass casualties. Hours earlier Eddie's team had confirmed the van as being explosives free. Now he faces the terrifying possibility that his team's surveillance operation has been sabotaged via an al-Qaeda infiltrated mole. But suspicion quickly fastens onto Eddie and he is catapulted down a nightmare road of treachery and deception, and Eddie must use all his experience and resources to survive.