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? Rumour abounds With Paul Gray and Bob Newman, Tweed discovers the weird village of Carpford, hidden away in the North Downs and containing strange inhabitants in strange houses The team also encounters a number of high-profile personnel, any of whom could be involved in the plot to devastate London Key informants are slaughtered ruthlessly, one by one Time has run out This Tweed does know Unless Tweed's team track down the mass killers, thousands of Londoners will be annihilated