Clark Gable delivers a strong performance as Jack Thornton, a courageous prospector in the Yukon. His good fortune begins when he rescues Buck, a large, devoted animal that’s part dog, part wolf, from being killed. He also befriends Shorty, played by Jack Oakie, who possesses something like a treasure map of his own. Through considerable effort and with help from his canine companion, he manages to gather enough fund…