Sarto Sen shook his head. "It's impossible," he told the big engineer. "If we escape from here at all it will be by night, for by day the rooms and corridors outside are thronged with globe-men. And by night we could do nothing, for Alto, the sun itself, would not then be in the sky. Nor could we wait for its rising, there on the platform, since our escape would soon be discovered, and we should be attacked there. Our only chance is to get out of here by night, make our way up to the platform, and make a dash for our ship. If we can do that we can flash back to our own universe and get the help we need to crush these globe-people." "But when shall we make the attempt?" I asked, and my heart leaped at Sarto Sen's answer. "To-night! The sooner we get out the better. A few hours after dark we'll try it." He went on, then, to unfold his plan for escape, and we listened intently, while big Hal Kur's eyes gleamed at the prospect of action. Our plan was simple enough, and likely enough to fail, we knew, but it was our only chance. What course we would follow after getting free of our cell we did not even discuss. There was nothing for it but to make our break and trust to luck to bring us through the thousand obstacles that lay between us and the tower-platform which held our ship. The remaining hours of that day were the longest I have ever experienced. The slanting shafts of light from the loopholes seemed to move across the room with infinite slowness, while we awaited impatiently the coming of night. At last the light-bars darkened, disappeared, as the dying crimson sun sank beyond the rim of the world outside. Darkness had descended on that world, now, and here and there among the buildings and streets of the weird city outside flared points of red light. Still we waited, until the vague, half-heard sounds of soft movement and thrumming speech outside had lessened, ceased, until at last the only sound to be heard was an occasional shuffling movement of the guard outside the door. Sarto Sen rose, making to us a signal of readiness, and then threw himself flat on the floor of the room's center. At the farther side of the cell lay Hal Kur and Nar Lon, as though sleeping, with a thick roll of garments between them which resembled another sleeping figure. These preparations made, I stepped to the door and stationed myself directly inside it, to one side, my heart pounding now as the moment for action approached. All was ready, and seeing this, Sarto Sen began his part. Lying there on the floor he gave utterance to a low, deep groan. There was silence for a moment, and then another low moan arose from him, and now I heard a shuffling movement outside the door as the guard there approached to listen. Again Sarto Sen groaned, terribly, and after a moment's pause there came a rattling of bolts as the guard slid them aside. I flattened myself back against the wall, and in a second the door opened.