Who cares about the past?

Twilight find herself trapped in a strange castle, left with nothing but a lantern, a saddlebag, and a couple bottles of pills. What happened to Equestria?

When Twilight wakes up in Canterlot castle, there are no ponies inhabiting it. Princess Celestia and Luna are both gone, and so are the guards. Equestria can't be gone...or can it? This time, not even friendship can fix this. At least...not for now.