Epistemology seems to enjoy an unexpectedly glamorous reputation in these days. A few years ago, William Safire wrote a popular novel called The Sleeper Spy. It depicts a distinctly post-Cold War world in which it is no longer easy to tell the good guys—including the good spies—from the bad ones. To emphasize this sea change, Safire tells us that his Russian protagonist has not been trained in the military or in the police, as he would have been in the old days, but as an epistemologist.