Constable Drake was to meet Sergeant Preston in a camp halfway between White Rapids and a settlement called Porcupine, but he had lost his way in a desolated area just south of the Endicott Range. He rode the runners of his sled, pulled by dogs, across the glare ice of a frozen stream. On either side, the perpendicular walls of a canyon rose to a height of fifty feet or more. Presently the Constable saw a large opening in the south wall of the canyon. It was an entrance to a cave...