The Poet's Grimoire, a mysterious tome which has kept it's secrets for decades, is stolen by a team of three thieves. Everypony is at a loss when the thieves seem to disappear without a trace. All but one Earth pony named Cross Hook, a former friend to the group. With the help of Twilight Sparkle, he finds himself pursuing Penn Jewell and the brothers Dust and Echo into a world he would have never expected to find himself in. Can he stop his rivals? Or will the book's secrets be revealed at the mercy of Equestria?