The "Amazing Hoofdini", legendary alicorn magician who disappeared long ago makes an appearance in Canterlot one day. But it turns out that this magician's 'disappearing act' is a little more detailed than anypony realizes when he steals a magical artifact from Princess Luna herself! With the Mane Six in the Crystal Empire, the Princess turns to Discord to track down the theif and return her stolen property... which is a little more personal than she's willing to admit.