by Kurt Vonnegut.  What goes on in the mind of a person who is known only to himself and one or two other people in the entire world, one of whom is the President?  Told in the first person by our "hero" Howard Campbell, he recounts his life as an American living in Germany, and his rise to prestige during WWII as one of the greatest Nazi propagandizers ever.  All this serves merely as his cover while he works as a spy for the Allies.  His cover is so complete, his Nazi act is so convincing, and his true actions are known to so very few people that he finds himself hunted as a war criminal during peacetime and revered by an oddball band of anti-semite activists.  All the while, Campbell keeps the truth to himself, seeming to enjoy the chaos that his wartime theatrics is creating around him.  I don't know much about Kurt Vonnegut's own mental state, but I will say that of any of the authors I read regularly (ie, more than one of their books), he is the one who I would say could tell such a schizophrenic tale from the first person omniscient with such excellent humor.  Highly recommended.