Robert Caro has spent thirty-eight years writing the biography of one man. The fourth volume of that work, like its three predecessors a giant achievement and certain best seller, is about to be published. But Caro is not done. The world and all that's in it has changed, and still Caro is not done. Time has eaten everything around him, and still he is not done. But until he is done, one part of the world that we will never see again will not die.