The night after the night she witnessed a mystirious light, Twilight Sparkle witnessed a dark mist moving through the city, followed by a pair of red eyes and darkness out of nowhere. The same night, Princess Celestia is hunted by a nightmare which is non, according to her sister. On the next day, they receive a message from the Crystal Empire: Captain Flash Sentry was set in an unknown state of mind and always repeates the words: "The circle is closing itself. The end is near." after he engadged a shadowy intruder in the Empire's library. Coincidence? The shocking answer comes with heavy consequences...
The first part of a trilogy.