Daily Sketch: Misprint

So how's this for a misprint? I'm right in the middle of the huge final climax of Terry Pratchett's 'Mort', when the story suddenly jumps ahead fifty pages. The next thirty or so pages are the end of the story, which are then repeated to the end of the book. How does this even HAPPEN?

Obviously I'm a little pissed off at the book's printing company right now T___T