space-time continuum perhaps a billion light years distant from either Earth or Tarth, is a third world. On the warp it is very close. The River of Ice leads to it. We call it the Place of the Dead." "But the Golden Ape--?" "--inhabits the so-called Place of the Dead. Their world was dying, but Portox saved them. I think ... the science is beyond me ... the entropy of their galaxy was running down ... their world perishing, freezing ... when somehow with his great science Portox claimed for their use the unavailable energy in their ... their thermodynamic system, and saved them." "Why do you frown so?" "Words. Words only. I don't understand. I can only act." "You can act," Ylia said, hugging herself tight against him. "For Tarth and the future." "For Tarth and the future," Bram Forest said, but he hardly heard the words. Ahead of them in the cold clear air a wall seemed to rise. It came up so suddenly, and, in fact, the air had cleared so suddenly from the accustomed murkiness, that Ylia was afraid. "It is in the legend," she whispered. "The Black Wall, Bram Forest. And beyond it--the Place of the Dead." "More accurately, an edge-on view of the space-warp, where it meets the normal world." But although he spoke the words of Portox, Bram Forest did not sound too confident. "We're coming closer to it, Bram. Hold me!" He held her. There was nothing else he could do. The current swept the barge on inexorably. The Black Wall reared ahead of them, frowned down at them, seemed to block off all the rest of the universe and all reality whether of Earth or of Tarth.... The barge penetrated the wall. Black and solid-seeming, solid as stone, it yet offered no resistance. The barge disappeared within it. Behind the barge, rope-trailing so close that its prow almost scraped the royal wood, was a skiff in which, shaking and afraid yet somehow triumphant because he had heard Bram Forest's strange words, was Hultax the Abarian. CHAPTER XV _The Golden Ape_ Hultax the Abarian shook himself. He had lost consciousness as every nerve-ending in his body had screamed with pain. Did this have something to do with the warp--warping?--Bram