Trapper Link Stevens and his half-wild dog Chiri go into the Caribou mountains--a wild, unexplored region from where no man has returned alive--to rescue a naturalist and his pilot whose plane crashed. After the pilot, who became unhinged after the crash, steals all of Link`s supplies, Link, the naturalist, and Chiri have to as if in the Stone Age in order to survive. Will they ever make it out?