In the final book of the Cragbridge Hall trilogy, Abby, Derick, and their friends must utilize their skills in time travel and technology to survive roving bands of dinosaurs, race through space, build robots, and fight virtual dragons.It’s known as the Race—an annual tournament where teams of students compete in the hopes of winning an unbelievable prize. But before this year’s competition, Derick and Abby receive a terrifying message from the future: Charles Muns’s plan to control history is going to succeed. It will cost countless people their lives and change the destiny of the world. And there is nothing anyone can do to stop them.Despite the danger, the twins gather their friends and enter the Race, ready to compete against the best of the best in order to claim what might turn out to be a key of ultimate power.Can they compete the Race in time and stop Muns? Or has the future already been written?A page-turning, time-travel adventure that teaches powerful lessons about choice and consequence, believing you can do hard things, and valuing our history.