Tweed, reverting to his one-time role as a detective, faces the most frightening challenge of his career. Is al-Qa'eda about to attack London with a strategic onslaught that will make September 11 seem like a tactical attack? Rumours abound as time runs out. With Paul Gray and Bob Newman, Tweed discovers the weird village of Carpford, and also encounters a number of high-profile personnel, any of whom could be involved in the plot to devastate London. But unless Tweed's team can track down the mass killers, thousands of Londoners will be annihilated.