This book is suitable for ages 9 to 12 years. When eleven-year-old 'Banjo' Mongomery's dad builds a doggy door out of scrap metal from a government science lab, he opens a time tunnel back to the age of dinosaurs. Banjo's Chow Chow, Dino, discovers the time tunnel and leads Banjo and his best friend Lee Wong back to the age when Tyrannosaurus Rex was the top of the food chain - and the big question was how fast can you run?It's non-stop action and adventure for paleontologist-in-training Banjo, Lee and Dino the dog. What is the source of the mysterious metal? What will they discover in the age of dinosaurs? And who is the other mysterious visitor to the past? It will take all of Banjo's wits to survive Tyrannosaurus Forest, get home in time for dinner and keep their time-travelling secret from his nosey little sister. Fortunately, he has the amazing Dinosaur Dog on his team. The book launches Dino, Banjo and Lee into the first of a series of astounding stories, amazing adventures and thrilling discoveries in the age of dinosaurs.