Following the discovery of gold in the Yukon, Sergeant Preston and his great dog King set out for Mackenzie Bay with mail for the schooner, Penguin, whose master Captain Beaufort was engaged in a scientific survey of Arctic waters for the Canadian government. It was in late September with the first snow heralding the rapid approach of winter, when they reached their destination, a small Eskimo village, from which the mast of the great sailing ship could be seem some distance off shore...