Following the events of The Night Mare's Nightmare, both Princess Luna and Maeve recover, with Maeve now back at home in Equestria with Princess Luna. Now that they are home, the healing can begin.
Maeve, a strange human girl with mysterious magic that she should not have, is now learning how to control her magic. Her very existence is a riddle, but no answers seem forthcoming. Isolated within Canterlot, she has become Princess Luna's student, and her best friend is an earth pony colt name Red Russet.
While trying to help Maeve, Princess Luna, beset by her own past, must confront the emptiness that lurks within her, lest she be consumed by her own past transgressions.
Together, both of them will face their pasts.