From the criticallyacclaimed author of Float comes a newwhirlwind adventure about a pair of kids who must break all the rules oftime travel, perfect for fans of Gordon Korman and John David Anderson. Regan Fitz and Elliot Mason have been enemies since theystarted training to become Glitchers--people who travel through time to preserveimportant historical events. But everything changes when they find a letterfrom Regan's future self, warning them about an impending disaster thatthreatens them and everyone they know.Will they be able to set aside theirpast in order to save the future?