In London a senior Russian KGB officer defects: his tip-off traps a top KGB agent in Oslo. In Bonn the West German Head of Counterintelligence flees to the East, while in Rome a KGB colonel suddenly flees to the West. In the United States a KGB double agent vanishes: in Russia the CIA agent he betrays is arrested. Tom Mangold reveals what lies behind this complex pattern of defection and deceit: and looks at the impact of spy wars on next week's super-power summit and at which side is really winning in this extraordinary Year of the Spy.