Rainbow Dash's world is about to be flipped upside down.

Not in a literal sense, of course, but metaphorically speaking. You see, a curious letter from the Princess has been presented to her at an ordinary, run of the mill picnic, leading the poor mare on a wild goose chase across Equestria. Who is the one responsible for it? What does the Princess want with her?

Just what kind of burden rests on her hooves?

It's time for you to understand, Rainbow. Friends, enemies, strangers, they're all the same once you get to know them. Keep an eye on your shadow, Rainbow Dash. It's imperative that it stands by your side.