What if Daring Doo was a real mare, whose existence was covered up through the creation of a 'fictional series' about her? What could drive the princesses to do such a thing? And what does this all have to do with the death of the Great-Uncle of Twilight Sparkle? Danger is brewing as an ancient evil is uncovered from the mists of the past. The fate of the world is in the hands of six friends.