Two weeks before the 1000th Summer Sun Celebration, Moondancer discovers a forgotten spell scrawled across the pages of an ancient book. Casting it threatens to turns her world upside down: faced with glimpses of an Equestria contradicted by historians, she must use all of her intellect to piece together the mystery surrounding Mage Meadowbrook, Princess Celestia, and the mare with the mane of stars—before the project destroys everything she's worked for.

It's a good thing she can rely on Twilight Sparkle for help.

Spanish Translation from Spaniard Kiwi!