Ah, Discord's Apple. You were going so well, right up to the last few pages. Great plot. Intriguing characters. Inventive devices. Hey, when I finish this one, I should find more by this author.
And then, right at the end, something amazing happened. That plot that you spent the last hundred pages on, the one that kept me turning the pages? Gone. Those characters? Mostly gone. Their world? Vanished. Something magical happened.
I know it's tough to be an author, but has the concept of a satisfying conclusion evaded you?