The old Aberfoyle mine in Scotland, that was thought to have been mined out ten years earlier is reactivated, when a dedicated old miner, Simon Ford, makes an astonishing discovery. He contacts the old manager of the mine, James Starr, and the discovery leads to a large vein of coal that will take generations to mine out. Soon the New Aberfoyle mine is opened and everyone begins to profit again; however, a mysterious “goblin” threatens the entire mine.