Princess Luna has returned to Canterlot, Luna Lovegood is back at school, the rift between the universes has been sealed, and everyone lived happily ever after.
Except that they didn't.
Weary of her life back in Equestria, Luna re-opens the portal and plunges directly into the magical world of Hogwarts once again. However, once she gets there, she finds that it isn't all cupcakes and roses; Voldemort is gone, but a new, greater threat looms overhead, ready to destroy not only this world but her own as well.
(This story is the sequel to "A Tale of Two Lunas". You should probably read that first. Rated Teen for occasional naughty language and general tomfoolery).