The book is a very quick read and doesn't really have alot of historical facts or detailed descriptions. This book is no different than any other Vonnegut book in that its very ambiguos. We never find out why the Nazi's decided to give Campbell his own show or why the OSS decided to use Campbell as a spy.
Despite this the book is a very fun read. Its funny and often hilarious (especially when describing aging racists in America). I would reccomend this book to any reader of any age. Its, quite simply, a good story.
You can read this easily in one sitting, and puzzle over it for a lifetime.