Twilight Sparkle always studies the movement of the stars. But one night she finds a series of errors in her note taking. These errors seem nothing at first, however these turn out to be clues to future events that put the very lives of other ponies in danger.

Canterlot vanishes in a mysterious explosion, an explosion which engulfs all of Equestria. Twilight manages to save herself, but the world she finds herself in is not the one she remembers. Her friends have no memory of her, the world is trapped in darkness, and Celestia is missing. Can Twilight figure out what's happened to her and the rest of Equestria before the darkness overwhelms her?