Many people welcomed the Prague convention, soon to be ratified by the Queen, as a milestone in East-West détente. But Harry Danter wasn't one of them. In fact he was prepared to go to remarkable lengths to make sure that the treaty was never signed. The Special Duties Unit had a good reason to be alarmed: Danter meant business. With his hijacked missiles and rocket launcher he had at his disposal the most sophisticated low-lever weaponry in the world - and the most deadly. If Danter's plan succeeded, there would be no Convention. Because before the Queen landed at Prague airport on her state visit, the Royal plane would be blasted out of the sky….