George Kennan and Paul Nitze were the Adams and Jefferson of the Cold War. They were there for the beginning, they witnessed its course over almost half a century, and they argued with each other constantly while it was going on. But they maintained throughout a remarkable friendship, demonstrating-as few others in our time have-that it is possible to differ with civility. Nicholas Thompson's is a fine account of that relationship, carefully researched, beautifully written, and evocatively suggestive of how much we have lost because such civility has become so rare.