Entt said: “We will land here. If there are Gians, they must not see us coming.” We left the aëro in a recess at the summit of a small rise. Invisible again, we started forward on foot. What revulsion I had felt, flying in the air and gazing down to where monsters might lurk in the darkness, was intensified now. Here on the rocks, walking, seeing nothing, hearing only that monstrous torrent ahead, I felt my flesh creeping with horror. Why, any moment something unspeakable, lurking here, might spring upon us. * * * * * “Keep hold of me, both of you,” Entt whispered. Silent shadows, we walked swiftly. The ground was rough, broken now into great crags among which we climbed, steadily ascending. There was light ahead--a milk-white glow, faint as star-dust. And a jagged black wall, clifflike, rising into the void beyond my vision. A few minutes of climbing, and the roar grew. It beat upon me deafeningly. It seemed for a moment to engulf all my senses. A titan roaring--this torrent of water. An infuriated titan--yet still in leash. The milk-white radiance broadened; beside us the rock wall now was close. Entt stopped us. We stood at the summit of the rise up which we had come. Entt spoke, shouting at us now, for the blare of dashing water tore at his words and flung them away. “There is the gate-house. I think there are no Gians here.” We followed his gestures with our gaze. I stood peering, holding my weapon in my hand. From here a path led down the rocks to the right. A hundred feet away down there the cliff wall rose sheer, smooth and black. The path, from where we were standing, went down the declivity and came to a small door, a gateway in an artificial wall. Beyond it, looking down upon the wall from this greater height, I could see a small inner courtyard, with the wall inclosing it, and another door. Beyond that, a narrow, precipitous flight of metal stairs, with a wall around the bottom of them, led upward a hundred feet. Up there, perched like some aerie against the cliff-face, was a small black building, the gate-house. It hung there, with a dim oval of radiance from within marking its window. Tad shouted at my ear: “If those courtyard doors are open--Or we might climb the walls.” Those courtyard walls seemed no more than ten feet high. No Gians were here, and the whole place appeared deserted. “Wait a moment,” Entt cautioned. “If there is any one here, we’ll see movement.” The little metal house up there on its perch seemed unoccupied. Its door was ajar, showing a slit of light, and the window on this side was open. The room within was lighted. Was any one there? We waited, closely watching, for any shadow of movement.