The voice went on, seeming now to come from the ceiling, "Treatment will begin tomorrow. During convalescence Murdoch will care for Waverill. Sight will be restored within four days and you will be here one day after that then you may return to your ship. You will be protected from each other while you are here. If you keep your bargain you will be of no concern to us after you leave." Murdoch watched Waverill's face but it showed nothing. He was sure the billionaire already had arrangements to shut him up permanently as soon as he was no longer needed, and he didn't intend, of course, to let those arrangements work out. II It developed that when the robot spoke of days, it meant a twenty-four-hour cycle of light and dark, with temperatures to suit. Under other circumstances, the place would have been comfortable. The pantry was stocked with Earthside food that didn't help Murdoch's confidence any, since it was further evidence of the aliens' contacts with men. He cooked eggs and bacon, helped Waverill eat, then washed up the dishes. He felt uneasy without his clothes; the more because the weapons in them, through years of habit, were almost part of himself. He thought, I'm getting too jumpy too soon. My nerves have to last a long time yet. While he was putting the dishes to drain, the robot walked into the room and watched him for a moment. Then it said to Waverill, "Keep your hand on my shoulder and walk behind me." It reached for Waverill's right hand and placed it on its own right shoulder, revealing in the process that its arm was double-jointed. Then it simply walked through the wall. The blind man, without flinching and perhaps without being aware, passed through the seemingly firm substance. When they were gone, Murdoch went quickly to the wall and passed his hands over it. Solid. The voice came from the ceiling, "You can not penetrate the walls except when told to. Any place you can reach in this half of the grounds is open to you. The half where your ship is will remain cut off. You may amuse yourself as you wish so long as you do not willfully damage anything. We have gone to great effort to make this place comfortable for Terrans. Do not impair it for those who may come later." Murdoch smiled inwardly. He'd known the walls would be solid; he'd only wanted to check the alien's watchfulness. Now he knew that there was more to it than just the robot, and that the voice was standard wherever it came from. Not that the information helped any. * * * * * He walked back to the middle of the building and went through the door across the lobby. In that half of the building were a library, a gymnasium and what was evidently a Solar System museum. There was nothing new to him in the museum. Though there were useful tables and data in the library, he was too tense to study. The gymnasium he'd use later.