Schoolmates Eric, Dominique, Ajay, and Josephine are in their homes getting ready for a normal school day after two successful time-travel adventures. But the day might not turn out to be so normal after all! The kids' parents remind them that today is Coronation Day, and when they get to school, they find the Pledge of Allegiance replaced with an Oath to the King. Clearly, something is amiss, and the only way to fix it is to return to the Smithsonian,...