Book seven in Robert Irwin's exciting book series. Discover a world of prehistoric adventure and dinosaurs. Robert and Riley are visiting Dinosaur Cove in Victoria, a dig site that called into question whether all dinosaurs were cold-blooded. Even the boys can't seem to agree! When they get transported to a time when Australia was still connected to Antarctica, the boys agree on one thing; it's freezing! It's a battle to stay warm as Robert and Riley race to settle the mystery of the polar dinosaur once and for all.