"A powerful, propulsive piece of thriller writing...Porter has consolidated his reputation for writing some of the best espionage thrillers around." -Guardian (UK)The head of the US National Security Agency is assassinated in spectacular fashion at Heathrow. An airport employee and his family are found murdered in their council house in Uxbridge. In New York, a fashionable Upper East Side osteopath receives two postcards showing the Empire State Building....