Main character and narrator of the story is Howard W. Campbell Jr., who moved with his parent to Germany between world wars and became a play-writer and leading Nazi propagandist. He tells the story of his life from a Israeli prison. He is there to be tried for war crimes. But the fact is, that Campbell was in fact an American spy, who was sending hidden messages through his propagandistic broadcast. But the government can't acknowledge this fact after the war - he was too much hated by American patriots. He is therefore permitted only to disappear and live secretly in New York.
I enjoyed the book - I like Vonnegut's works and they are even more fantastic in original, than translated. On the other hand I am aware of the fact, that I have missed many wordplays and references, that non-native speaker just can't see.
Campbell is truly interesting character - he is somehow lost in his life. He mostly does what he is told to do or what he sees as appropriate. He never believed in Nazi ideology. But nobody knew it. And almost everybody hated him. He was rather passive in his life - never stood for something he belived in. The biggest moral of the book is:
"We are what we pretend to be, so we must be careful about what we pretend to be."
I would gladly read some more books in English. But the publishers have so strange policy on Amazon - English e-books are sold to foreigners for considerably higher prices... I am reading some goblin tales from Jim. C. Hines and plan to read Lord of the Rings in original... but who knows.