Lone Pup is a Tyrannosaurus Rex pup--the only survivor of the nest. Lone Pup is small but he's smart and dangerously curious. His father Strong Jaw and Mother Protector teach him about the traditions of the Tyrannosaurs--the Mighty Hunters--as well as Horn Faces, Smoothskins and they warn him about the Carrion Eaters--the dromeosaurs. That's the least of Lone Pup's worries. Lone Pup has to make the arduous trek north to the hunting grounds for the Angry Mountain Clan. To get there he has to pass the raging river, the wastelands, the Thunderfoot herds and above all the angry mountains!Waiting for Lone Pup is the greatest threat to his future: his Tyrannosaurus clan. Will they accept him?The question is decided when the great Northern Clan of Tyrannosaurs invades the clan's hunting grounds. They are led by Scarface, a huge bull who flouts all the traditions of the Mighty Hunters. Scarface is cunning and cruel but Lone Pup stands in his way!