Harley is back with another inventive adventure! This term begins with a school trip to the coast, where Harley stumbles upon a mysterious fossil. Could it be that Harley has discovered an entirely new dinosaur species? Meanwhile, eager to best her class nemesis Fenelda in the contest for best invention, Harley dreams big with her attempt to invent a time travel machine. It doesn’t seem to work, but soon strange happenings all over Inventia make her question whether the time travel machine might work after all! But what to do about the huge dinosaur that has been spotted in Forgetown?