Dantor beamed. "That is exactly why I sent for you," he said. Then sobering anew, he added, "But I fear that would not be the end. They will not give up. Another emissary would be transmitted to duplicate Antazzo's exploit on Earth and in five of your years the danger would again be faced. They would take infinite precaution to prevent a second failure. We must make it forever impossible--now." "How can we? My God, it's hopeless!" Blaine groaned. "Nothing is hopeless, my boy. Consider the plight of the Rulans. No, there is still hope and we will leave you to think it over--if you are willing. It is necessary that we Rulans show our faces above before we arouse the suspicions of the guards." "Of course we're willing. We'll stay as long as you say--and help." Blaine was intensely earnest and Tommy chimed in with his old time fervor and enthusiasm. But hope of success seemed remote. A murmur of approval came from the assembled Rulans, and Dantor wiped a trace of moisture from his tired old eyes. "Thank you," he said simply. "This chamber is insulated from the searching rays of the crystal spheres. You are safe for the present and will be supplied with everything you need. And I shall return shortly to discuss the matter in further detail." * * * * * The two Earth men were alone then, in the uncanny silence of the underground retreat, regarding each other with awed comprehension. What patient, hopeless creatures these Rulans were! Knowing they were doomed, and without thought of their own safety, they were bending their every effort to the impossible task of saving the universe from the madness of the Llotta. "What do you know about that?" Tommy said, after a while. "It's true, what he said?" Blaine asked. "What would happen to our world, I mean--and to the rest?" "Not a question of doubt. He's doped it out to a T. Smart guy, this Dantor." "What do you think? Is there a chance? Think--" "Hush!" Tommy interrupted him. "Didn't you hear something?" The silence was ghastly; depressing. Blaine heard distinctly the beating of his own heart. Then it was there again, that sound--a muffled scream from the other side of the stone door. A woman's scream of desperate entreaty. A shuddering, long-drawn moan, trailing off into deathly silence. CHAPTER VI _Ulana_ Blaine was tugging at the lever he had seen the Rulans use in opening the stone door from the inside. Tommy, less excited, tried to press one of the invisible cloaks into his free hand. "Here," he begged. "Don't be a damn fool! They'll get you, the devils." But the great block of stone was swinging already and the young pilot squeezed through and into the passage. He stumbled over the crumpled figure of a young girl and into the arms of one of the green-bronze guards.