If there are three things Principal Celestia can't stand, it's paperwork, princesses and her past. Unfortunately, the first makes up her job... and she desperately needs the second to help her resolve the last.
Principal Celestia always has wings in her dreams. So when a magical clash in front of her school sets her phantom wings to itching, her life turns upside down. And she hasn't even heard about Equestria yet.
Twilight thought she'd had enough excitement for one day after meeting her human counterpart. Or so she thought until she was met with the uncanny feeling that Pinkie Pie was acting, well, a bit too equestrian.
A murder in the mirror world brings Sunset Shimmer back to Equestria, with her world's Twilight Sparkle in tow. While they track the killer, they struggle to reconcile the differences between them and their mirror counterparts.