There is more to a book than the end. Just because you know what happens in general doesn't mean you can't enjoy reading the book at all. Why do people re-read books? Why do people watch movies based on books, or go back and read the book after they've seen the movie?
I'm not going to destroy my prose with legalistic gerrymandering just because you're too emotionally underdeveloped to enjoy a story after knowing details about it.