One hundred and fifty years ago: The first dinosaurs were cloned. Soon after, they replaced humans at the top of the food chain. The only way to survive was to move into underground compounds. Five years ago: Sky Mundy s father disappeared without a trace. Today: Sky has just stumbled upon a clue that points to the surface. To find her father and possibly even save the world Sky and her best friend, Shawn, are venturing topside to a land reclaimed by nature and ruled by dinosaurs.