The dog Buck lives a privileged life in the family of a California judge. But when gold is discovered in the Yukon Valley and thousands of men rush north, Buck is stolen from his home and sent north to pull sleds for the Canadian mail service. Buck finds he must learn fast or die, and the new law of life is primitive the law of club and fang. London reveals the lengths to which men will go to satisfy the gold lust, and he explores the animal instinct...