Book excerpt: The American President, on a State Visit to Britain is giving a major address to a top-level audience in Westminster Hall. Ferocious security is provided by a joint force of the United States Secret Service and Scotland Yard. Then a stolen ambulance runs into trouble with the Parking Authorities. A hapless Member of Parliament, having mislaid his crucial pass, is barred from Westminster, his bicycle regarded as a potential lethal weapon. And a man going by the name of Jones, although born in Karachi, successfully slips through the barriers, and whole new ball game starts