Underwood went to the control room to check the observations. Before his eyes the mighty fleet was melting into the depths of space toward Earth. He checked their velocity, and frowned. What purpose was there in this sudden retreat? Did it signify a trap that had been prepared for the scientists on the Dragboran planet? There was no way of knowing--and no way of combating the unknown. Underwood stood up from the viewing plates and nodded. "Let's go." _CHAPTER THIRTEEN_ As if awaiting the completion of the final step in his long journey to destiny, Jandro watched the stars swing past the field of his vision as the _Lavoisier_ turned sharply to get into the shadow of the planet to prevent observation by the fleet. Underwood watched the alien individual, trying to fathom the mystery of Jandro and his people. What was the truth about their myth of a fall from Heaven World, which Jandro admitted he did not believe? How had the strange mass of flesh originated, from which they perpetuated the unknown organs within their own bodies? Underwood wondered if Illia were right, if it were the harnessing of some cancerous mutation that had occurred long ago in some forgotten individual and perfected for the whole race. Most important of all, could Jandro and his people have any bearing on the problem that had brought the scientists across the vastness of space? To Underwood it seemed unlikely. They had come in search of a strange and deadly weapon, hinted at only in scant records half a million years old. Jandro's people knew nothing of the vast techniques of producing metallic instruments and equipment. They were wizards in glass technology, and in surgery, but it was doubtful if they even knew of the existence of electricity. The journey was only a matter of hours from the moon to the planet, but it seemed the longest part of the trip to the scientists who crowded about the scanning plates turned up to their highest sensitivity. * * * * * From a quarter of a million miles away, the faint details of the ancient cities began to be recognizable on the large screens. The sharpness with which they were revealed was awe-inspiring, for the airless world permitted perfect clarity of vision, and there had been none of the ceaseless winds that were quick to hide the works of man on other planets beneath dunes of sand. Here it looked as if the inhabitants had made a quick, orderly exodus only yesterday, leaving the vast cities for whoever might want them. Phyfe was ecstatic at the sight. "The archeologists' dream," he said. "The perfect preservation of an ancient civilization." "I can't see how the atmosphere was destroyed without considerable effect all over the planet," said Underwood. "It doesn't seem possible. Wait--there it is!"