It's the year 1000 CE. Everypony is in a stir over the upcoming Summer Sun Celebration. Surely, there must be something important about that number.

Professor Twilight Sparkle certainly seems to think so. Enough, in fact, to leave her tower in Canterlot, to travel to a town full of secrets and danger. Maybe, if she's lucky, she'll be able to put a stop to everything before it's too late.

Whether her boss likes it or not.