The story is set in the Yukon during the 19th-century Klondike Gold Rush a period when strong sled dogs were in high demand. The novel’s central character is a dog named Buck, a domesticated dog living at a ranch in California as the story opens. Stolen from his home and sold into the brutal existence of an Alaskan sled dog, he reverts to atavistic traits. Buck is forced to adjust and survive cruel treatments, fight to dominate other dogs, and survive in a harsh climate. Eventually he sheds the veneer of civilization, relying on primordial instincts through lessons he learns, to emerge as a leader in the wild.