From London Cairo & Washington D.C. to Saudi Arabia Switzerland & Nigeria a team of American & British counter-terrorist agents attempts to track down a dangerous terrorist cell operating on a deadly global level. The nightmare begins after terrorists mistakenly release poisonous sarin nerve gas killing themselves & guests at a London hotel. British MI5 & MI6 agents believe a local terrorist cell is targeting members of their counter-terrorism unit & plotting attacks on the London & New York City subways. But when the investigation broadens to include American agents from the FBI CIA & NSA the subway threat begins to feel like a diversion. As the agents rush to determine the terrorists' real plans they find that they too have become targets in a deadly race to not only prevent the next attack but to also disrupt the far-reaching terrorist network.