Aram lay comfortably under the bank of sun-lamps in the underground infirmary. The days of rest and treatment had brought him back into condition again, and he felt fit and ready for action. He had begun to chafe at the inactivity, but Kant Mikal insisted that the time to move out against Kaidor had not come, and Jerrold was forced to be content with the older man's judgment. Deve sat with him in the infirmary, her slim body golden under the glowing lamps. Sitting near her, watching the graceful sweep of her pale hair as it brushed her shoulders, Aram was filled with a sense of well-being and contentment. "Aram," asked Deve, "have you had time to examine the Serpent? Are you familiar with that class of ship?" "I spent three years on Periphery Patrol with Serpent class scouts, Deve," murmured Aram sleepily. "There won't be any trouble...." He stretched himself and sat up. "But there's one thing I'd like more information on ... if I can be trusted with it." "Aram! We trust you! You know we do ..." protested Deve. "Kant Mikal told me the Serpent was ... undetectable. In all my years with the Fleet, I never heard of a spaceship that could not be detected." "Avon Marsh--one of our scientists--has developed an energy shield, Aram." "That's nothing new, Deve," said Aram. "The Fleet vessels have had them for years. They use them against attack by ray weapons of all kinds." "But this reaches into the highest frequencies," Deve explained. "It shunts all radiation around the ship. Of course, it can't be used during second order flight above light speed, but it wouldn't be of any value then, anyway." "You mean it shunts _all_ radiation around the ship? All? Even light?" demanded Jerrold with sudden interest. "Yes. At close observational ranges it results in a slight distortion--like a very clear lens, but--" "Then the ship is ... invisible?" Aram asked incredulously. Deve Jennet smiled. "Yes, among other things. And it prevents a radio echo being sent back to a detector, too." * * * * * Aram sank back thoughtfully. An invisible ship! His spaceman's mind toyed with the thought. It was like something from a naval officer's dream fantasies. A battleship so equipped could very nearly rule the plenum...! But Deve's next words cut that dream short. "The field is so limited, though," she said, "that only a two-man scout can be equipped with it. And since the shield works two ways, the occupants of the ship are blind. Nothing outside the ship itself can be seen." Jerrold was about to reply when Kant Mikal burst into the room. His grey hair was matted with blood, and his face was pale and drawn with pain and anxiety. "I should have listened to you, Jerrold," he breathed heavily. "We should have moved out long ago!" "Kant! You're hurt," cried Deve. Mikal gestured impatiently. "It's nothing! We have to get out immediately! Get ready...!" Jerrold and Deve were on their feet, reaching for their cloaks.