History is broken, and three kids must travel back in time to set it right! When best friends Dak Smyth and Sera Froste stumble upon the secret of time travel - a hand-held device known as the Infinity Ring - they´re swept up in a centuries-long secret war for the fate of mankind. Recruited by the Hystorians, a secret society that dates back to Aristotle, the kids learn that history has gone disastrously off course. Now it´s up to Dak, Sera, and teenage Hystorian-in-training Riq to travel back in time to fix the Great Breaks . . . and to save Dak´s missing parents while they´re at it. First stop: Spain, 1492, where a sailor named Christopher Columbus is about to be thrown overboard in a deadly mutiny! Each book comes packaged with a full-color, collectible Hystorian´s Guide - your key to unlocking an all-new online adventure starring Dak, Sera, and Riq. You´ll need all of the Guide´s hints, secrets, and codes to navigate the richly immersive worlds of Revolutionary Paris and other soon-to-be-revealed locations in a totally unique, story-driven gaming experience.