This is William Goldman's most famous novel, and if you've seen the movie, you owe it to yourself to read the book. All the elements are still there, but they're expanded and the whole is even funnier than the movie. Many people are still debating whether Goldman really just made up the frame for the story, or if it's really by Morgenstern...
THE SILENT GONDOLIERS
Recently back in print, this is another Morgenstern tale. It's more of a parable than an epic as was The Princess Bride. But if you've ever wondered why gondoliers are so silent or wanted more Princess Bride wit, The Silent Gondoliers is a fun and fast read.