Princess Luna is ashamed. Once again she has failed to protect her people during the Changeling invasion. What little redemption she has obtained since her release from the Nightmare has dwindled, and mistrust for her grows. So when something begins fillynapping young ponies all across Equestria near Hearth's Warming Eve, the royal alicorn finds herself the prime suspect. With tensions high and no new leads turning up, a desperate Luna decides to resort to an ancient magic that has been banned since her imprisonment to summon a demon to go undercover and find the true culprit. But will the witty djinni she summons be too much for her to handle?

Disclaimer: I do not own My Little Pony: Friendship is Magic or the Bartimaeus Trilogy. They belong to Hasbro and Jonathan Stroud respectively.