Dewey Decimal was the head librarian of the Royal Canterlot Library. When Twilight Sparkle returns to her hometown to perfect an ancient long-distance teleport spell, Dewey sees an opportunity to escape his humdrum life. Dragging his childhood friend, 'Blank Flank' Steven, along with him for the ride, the pair find themselves in lands far from the safety of Equestria. Facing strange monsters, spirits and races while making few friends, they'll test how much a cutie mark really defines a pony.