Slumbering deep beneath the catacombs of Canterlot Castle, the Eastern Library has laid abandoned for the better part of a millenium. A chance discovery by one Twilight Sparkle, though, leads her to its ancient shelves, thirsty for knowledge. But in its time alone, the library has grown host to things that thrive in the dark. Soon, Twilight will find that these shadowed words hold more than just stories.