As Tarzan travels through the jungle to the village of Opar, he encounters a treacherous Spaniard and his party, who intend great harm to the jungle lands.

Hordes of bloodthirsty wolves are slaughtering the arctic caribou, and the government's Wildlife Service assigns naturalist Farely Mowat to investigate. Mowat is dropped alone onto the frozen tundra, where he begins his mission to live among the howling wolf packs and study their waves. Contact with his quarry comes quickly, and Mowat discovers not a den of marauding killers but a courageous family of skillful providers and devoted protectors of their...