In this fourth book of the Galactic Treasure Hunt series, Galactic Treasure heroes Jake, Scott, and Nojo continue their adventuring when they get Lost in Time. The travelers take a wrong turn in a wormhole and arrive in the dangerous era of dinosaurs. The boys brave the mighty meat eaters and raging rivers of the past only to discover that alien criminals await them in the future. It's a thrill ride at both ends of time. Short chapters with illustrations on every page make it a great book for reading to children. The fantastic story is based on real science, so at the end of the book the author (a Boeing engineer) discusses the science. There is a special alien alphabet decoder in the book and clues written in the alien alphabet.