As bloody battle rages between the two surviving dinosaur kingdoms, Eleri and the other young exiles--including a peppy stegosaur, a stoic sauropod, a testy triceratops, and a mysterious spy--have temporarily thwarted the Carrion Kingdom, a conniving cabal of carnivores, and destroyed their secret stronghold.

Fearing that their cunning enemies will soon regroup and seek vengeance, the exiles must risk their lives by returning home to unite and lead the war-torn herds that turned their backs on them into one final, all-out battle for the very future of the land of Cretacea. Will they convince their kingdoms to follow them into battle against the true enemy, or will Cretacea be overrun by an army of predators?