The story of dinosaur hunter Barnum Brown and his discovery of the first Tyrannosaurus rex for the American Museum of Natural History in New York.

Using photo-realistic, computer-generated images to illustrate what dinosaurs might have looked like in their natural environment, the author describes how an old ankylosaur (a plant-eating, heavy-plated dinosaur) living along the banks of a grassy lake is rescued from a T. rex attack.

Presents the adventures of Ely and a forty-foot Tyrannosaurus Rex who he found trapped in a cave behind his grandfather's house.

Contains facts about the tyrannosaurus rex and the velociraptor, comparing such aspects as their sizes, body types, and abilities.