When the Berlin Wall came down November 9, 1989, the decades-long division of Europe was over. But there was another event, just two weeks before, that also broke down barriers and changed the course of the Cold War. In the last week of October, the director of the Soviet All-Union Institute of Ultra-Pure Biological Preparations, Vladimir Pasechnik, was on a business trip to France. He used a phone booth in Paris to call the British Embassy and offered to defect. The British Secret Intelligence Service responded with alacrity, and Pasechnik was soon on his way to London.