"Come with me, and I will guide thee from this place," said the stranger.  And he led the way along the brink of the gulf till they came to a bridge, high and narrow and fragile, glittering like glass; but when Rheinfrid touched it he perceived it was built of ice, and beneath it ran a fierce river of fire, and they felt the heat of the river on their faces, and the ice of the bridge was dissolving away.