After heading out into the Everfree Forest at night to deliver a mysterious package from the princess to Zecora, Twilight and the others discover that their world holds darker things than they once thought possible. Just what was that rustling in the bushes behind them? Just what was in that package that the princess asked them to deliver? And just who is that mysterious person that appeared out of a flash of light?
Strange things are happening, but it will all turn out okay in the end. After all, monsters aren't real... are they?