This is one of my favorite movies, and it's a really good book too.
The author claims that it is an abridgement of a book by an S. Morganstern. He says that the book was written many years ago and that he took all the boring parts out.
Well, all of this was fiction. There was no S. Morganstern and there was no other book. He just made it all up. To me, it shows the genious of William Goldman. I was so intrigued by his story.
It's a crazy world isn't it.