Equestria is under threat by a terrorist group that seeks to return things to the old days. To the days that the three tribes ruled the country, not the alicorn sisters Celestia and Luna.
Maud is home alone for a night. The perfect chance for Trixie's first sleep over at her totally-not-girlfriend's house. But, what if two of her sisters haven't actually left?
A new trio of girls take the school by storm, inciting a music battle by tapping into the students darker desires. The magic, however, incites something different in Trixie and Maud; revenge and obsession.