The deep voice had a sudden ring of power.
“This device is the key to the energy of the stars. For stars shine with the liberated energy of building atoms, of hydrogen converted into helium, chiefly, through the carbon cycle. This device will start the integration process as a chain reaction, through the catalytic effect of a tuned rhodomagnetic beam of the intensity and frequency required.
“The humanoids will not allow any man within three light-years of the Central, now — but they can’t suspect the possibility of this device. I can use it from here — to turn the hydrogen in the seas of Wing IV into helium, and most of the helium and the oxygen into heavier atoms, still. A hundred years from now, astronomers on this planet should observe the flash of a brief and sudden nova in that direction. But the humanoids ought to stop, the instant we release the beam.”
Underhill sat tense and frowning, in the night. The old man’s voice was sober and convincing, and that grim story had a solemn ring of truth. He could see the black and silent humanoids, flitting ceaselessly about the faintly glowing walls of that new mansion across the alley. He had quite forgotten his low opinion of Aurora’s tenants.
“And we’ll be killed, I suppose?” he asked huskily. “That chain reaction—”
Sledge shook his emaciated head.
“The integration process requires a certain very low intensity of radiation,” he explained. “In our atmosphere, here, the beam will be far too intense to start any reaction — we can even use the device here in the room, because the walls will be transparent to the beam.”
Underhill nodded, relieved. He was just a small businessman, upset because his business had been destroyed, unhappy because his freedom was slipping away. He hoped that Sledge could stop the humanoids, but he didn’t want to be a martyr.
“Good!” He caught a deep breath. “Now, what has to be done?”
Sledge gestured in the dark toward the table.
“The integrator itself is nearly complete,” he said. “A small fission generator, in that lead shield. Rhodomagnetic convertor, tuning coils, transmission mirrors, and focusing needle. What we lack is the director.”
“Director?”
“The sighting instrument,” Sledge explained. “Any sort of telescopic sight would be useless, you see — the planet must have moved a good bit in the last hundred years, and the beam must be extremely narrow to reach so far. We’ll have to use a rhodomagnetic scanning ray, with an electronic converter to make an image we can see. I have the cathode-ray tube, and drawings for the other parts.”
He climbed stiffly down from the high stool and snapped on the lights at last — cheap fluorescent fixtures which a man could light and extinguish for himself. He unrolled his drawings, and explained the work that Underhill could do. And Underhill agreed to come back early next morning.
“I can bring some tools from my workshop,” he added. “There’s a small lathe I used to turn parts for models, a portable drill, and a vise.”
“We need them,” the old man said. “But watch yourself. You don’t have my immunity, remember. And, if they ever suspect, mine is gone.”
Reluctantly, then, he left the shabby little rooms with the cracks in the yellowed plaster and the worn familiar carpets over the familiar floor. He shut the door behind him — a common, creaking wooden door, simple enough for a man to work. Trembling and afraid, he went back down the steps and across to the new shining door that he couldn’t open.
“At your service, Mr. Underhill.” Before he could lift his hand to knock, that bright smooth panel slid back silently. Inside, the little black mechanical stood waiting, blind and forever alert. “Your dinner is ready, sir.”
Something made him shudder. In its slender naked grace, he could see the power of all those teeming hordes, benevolent and yet appalling, perfect and invincible. The flimsy little weapon that Sledge called an integrator seemed suddenly a forlorn and foolish hope. A black depression settled upon him, but he didn’t dare to show it.
Underhill went circumspectly down the basement steps, next morning, to steal his own tools. He found the basement enlarged and changed. The new floor, warm and dark and elastic, made his feet as silent as a humanoid’s. The new walls shone softly. Neat luminous signs identified several new doors: LAUNDRY, STORAGE, GAME ROOM, WORKSHOP.
He paused uncertainly in front of the last. The new sliding panel glowed with a soft greenish light. It was locked. The lock had no keyhole, but only a little oval plate of some white metal, which doubtless covered a rhodomagnetic relay. He pushed at it, uselessly.
“At your service, Mr. Underhill.” He made a guilty start, and tried not to show the sudden trembling in his knees. He had made sure that one humanoid would be busy for half an hour, washing Aurora’s hair, and he hadn’t known there was another in the house. It must have come out of the door marked storage, for it stood there motionless beneath the sign, benevolently solicitous, beautiful and terrible. “What do you wish?”
“Er… nothing.” Its blind steel eyes were staring, and he felt that it must see his secret purpose. He groped desperately for logic. “Just looking around.” His jerky voice came hoarse and dry. “Some improvements you’ve made!” He nodded desperately at the door marked GAME ROOM “What’s in there?”
It didn’t even have to move to work the concealed relay. The bright panel slid silently open, as he started toward it. Dark walls, beyond, burst into soft luminescence. The room was bare.
“We are manufacturing recreational equipment,” it explained brightly. “We shall furnish the room as soon as possible.”
To end an awkward pause, Underhill muttered desperately, “Little Frank has a set of darts, and I think we had some old exercising clubs.”
“We have taken them away,” the humanoid informed him softly. “Such instruments are dangerous. We shall furnish safe equipment.”
Suicide, he remembered, was also forbidden.
“A set of wooden blocks, I suppose,” he said bitterly.
“Wooden blocks are dangerously hard,” it told him gently “and wooden splinters can be harmful. But we manufacture plastic building blocks, which are quite safe. Do you wish a set of those?”
He stared at its dark, graceful face, speechless.
“We shall also have to remove the tools from your workshop,” it informed him softly. “Such tools are excessively dangerous, but we can supply you with equipment for shaping soft plastics.”
“Thanks,” he muttered uneasily. “No rush about that.”
He started to retreat, and the humanoid stopped him.
“Now that you have lost your business,” it urged, “we suggest that you formally accept our total service. Assignors have a preference, and we shall be able to complete your household staff, at once.”
“No rush about that, either,” he said grimly.
He escaped from the house — although he had to wait for it to open the back door for him — and climbed the stair to the garage apartment. Sledge let him in. He sank into the crippled kitchen chair, grateful for the cracked walls that didn’t shine and the door that a man could work.
“I couldn’t get the tools,” he reported despairingly, “and they are going to take them.”
By gray daylight, the old man looked bleak and pale. His raw-boned face was drawn, and the hollowed sockets deeply shadowed, as if he hadn’t slept. Underhill saw the tray of neglected food, still forgotten on the floor.
“I’ll go back with you.” The old man was worn and ill, yet his tortured eyes had a spark of undying purpose. “We must have the tools. I believe my immunity will protect us both.”
He found a battered traveling bag. Underhill went with him back down the steps, and across to the house. At the back door, he produced a tiny horseshoe of white palladium, and touched it to the metal oval. The door slid open promptly, and they went on through the kitchen to the basement stair.