Twilight is being pestered by time-traveling clones of herself, all of whom are entirely too interested in her. It's up to Rarity to figure this out. Or try, anyways.
Derpy Hooves is still trying to figure out just what happened to Pinkie Pie after the mess with the duplicates, because she wants to meet a friend. But when that friend is somewhere inside Pinkie's head, things are going to get complicated.
A traitorous spy. An amoral archaeologist. A cloudheaded Wonderbolt. A secretary in way over her head. Leading them into the changeling hive is Princess Luna. There will be no going back. And none of them are prepared for what they'll find there.
Nightmare Moon won a thousand years ago, plunging Equestria into perpetual night. Now, as Princess Luna's student, Twilight Sparkle must contend with Celestia's unexpected return as a familiar group of ponies are thrown into conflict.