Applejack and Sunset Shimmer have been spending a lot of time together recently, so why do they suddenly seem so distant? And why does Sunset seem to have abandoned her new-found friends?
As kids, Twilight and Sunset were best friends, but a tragic accident cut their friendship short. Years later, Twilight investigates the incidents at Canterlot High and comes face to face with what appears to be a literal ghost from her past.