Book eight in Robert Irwin's exciting book series. Discover a world of prehistoric adventure and dinosaurs. While trekking up Mount Ruapehu, an active volcano in New Zealand, Robert and Riley are transported back to the Late Cretaceous. They encounter herds of hadrosaurs, ceratopsians and titanosaurs ,and even a dinosaur graveyard! But, a series of earthquakes and a volcanic eruption soon threatens the peace. Is this the end of the age of dinosaurs?