"That helps," Ballard said.

Gunther shrugged. "Might as well start. The robot's ready." He jerked a wire free from the golden helm.

"It takes a minute or so for the automatic controls to take over. Now-"

The immense figure stirred. On light, rubberoid soles, it moved away, so quickly that its legs almost blurred. Then it stood motionless once more.

"We were too close," Gunther said, licking his lips. "He reacts to the vibrations sent out by our brains.

There's your piggy bank, Brucel"

A little smile twisted Ballard's lips. "Yeah. Let's see-" He walked toward the robot. Argus slid away quietly.

"Try the combination," Gunther suggested.

Ballard said softly, almost whispering, "All is not gold that glitters." He approached the robot again, but it reacted by racing noiselessly into a distant corner. Before Ballard could say anything, Gunther murmured, "Say it louder."

"Suppose someone overhears? That's-"

"So what? You'll change the key phrase, and when you do, you can get close enough to Argus to whisper it."

"All is not gold that glitters." Ballard's voice rose. This time, when he went to the robot, the giant figure did not stir.

Ballard pressed a concealed stud in the golden helm and murmured, "These are pearls that were his eyes." He touched the b.u.t.ton again, and the robot fled into another corner. "Uh-huh. It works, all right."

"Don't give him such obvious combinations," Gunther suggested. "Suppose one of your guests starts quoting Shakespeare? Mix up your quotations."

Ballard tried again. "What light through yonder window breaks I come here to bury Caesar now is the time for all good men."

"n.o.body's going to say that by accident," Gunther remarked. "Fair enough. Now I'm going out and enjoy myself. I need relaxation. Write me a check."

"How much?"

"Couple of thousand. I'll tele-call you if I need more."

"What about testing the robot?"

"Go ahead and test him. You won't find anything wrong."

"Well, take your guards."Gunther grinned sardonically and headed for the door.

An hour later the air taxi grounded atop a New York skysc.r.a.per. Gunther emerged, flanked by two husky protectors. Ballard was running no risks of having his colleague abducted by a rival. As Gunther paid the air cabman, the detectives glanced at their wrist spotters and punched the red b.u.t.ton set into each case. They reported thus, every five minutes, that all was well. One of Ballard's control centers in New York received the signals and learned that all was well-that there was no need to send out a rush rescue squad. It was complicated, but effective. No one else could use the spotters, for a new code was used each day. This time the key ran: first hour, report every five minutes; second hour, every eight minutes; third hour, every six minutes. And, at the first hint of danger, the detectives could instantly send in an alarm.

But this time it didn't work out successfully. When the three men got into the elevator, Gunther said, "The Fountain Room," and licked his lips in antic.i.p.ation. The door swung shut, and as the elevator started its breakneck race down, anaesthetic gas flooded the little cubicle. One of the detectives managed to press the alarm warning on his spotter, but he was unconscious before the car slowed at the bas.e.m.e.nt. Gunther didn't even realize he was being ga.s.sed before he lost consciousness.

He woke up fettered securely to a metal chair. The room was windowless, and a spotlight was focused on Gunther's face. He manipulated sticky eyelids, wondering how long he had been out. Scowling, he twisted his arm so that his wrist watch was visible.

Two men loomed, shadowy beyond the lamp. One wore a physician's white garment. The other was a little man, ginger-haired, with a hard rat trap of a face.

"Hi, Ffoulkes," Gunther said. "You saved me a hangover."

The little man chuckled. "Well, we've done it at last. Lord knows I've been trying long enough to get you away from Ballard's watchdogs."

"What day is this?"

"Wednesday. You've been unconscious for about twenty hours."

Gunther frowned. "Well, start talking."

"I'll do that, first, if you like. Are Ballard's diamonds artificial?"

"Don't you wish you knew?"

"I'll offer you about anything you want if you'll cross up Ballard."

"I wouldn't dare," Gunther said candidly. "You wouldn't have to keep your word. It'd be more logical for you to kill me, after I'd talked."

"Then we'll have to use scopolarnin."

"It won't work. I've been immunized."

"Try it, anyway. Lesterl"

The white-gowned man came forward and put a hypodermic deftly into Gunther's arm. After a while he shrugged.

"Complete immunization. Scop is no good, Mr. Ffoulkes."Gunther smiled. "Well?"

"Suppose I try torture?"

"I don't think you'd dare. Torture and murder are capital crimes."

The little man moved nervously around the room. "Does Ballard himself know how to make the diamonds? Or are you the only one?"

"The Blue Fairy makes 'em," Gunther said. "She's got a magic wand."

"I see. Well, I won't try torture yet. I'll use duress. You'll have plenty to eat and drink. But you'll stay here till you talk. It'll get rather dull after a month or so."

Gunther didn't answer, and the two men went out. An hour pa.s.sed, and another.

The white-gowned physician brought in a tray and deftly fed the prisoner. After he had vanished, Gunther looked at his watch again. A worried frown showed on his forehead.

He grew steadily more nervous.

The watch read 9:15 when another meal was served. This time Gunther waited till the physician had left, and then recovered the fork he had managed to secrete in his sleeve. He hoped its absence wouldn't be noticed immediately. A few minutes was all he wanted, for Gunther knew the construction of these electromagnetic prison chairs. If he could short circuit the current- It wasn't too difficult, even though Gunther's arms were prisoned by metal clamps. He knew where the wires were. After a bit, there was a crackling flash, and Gunther swore at the pain in his seared fingertips.

But the clamps slid free from his arms and legs.

He stood up, looking again at his wrist watch. Scowling, he prowled around the room till he found what he wanted-the window b.u.t.tons. As he pressed these, panels in the blank walls slid aside, revealing the lighted towers of New York.

Gunther glanced at the door warily. He opened a window and peered down. The height was dizzying, but a ledge provided easy egress. Gunther eased himself over the sill and slid along to his right till he reached another window.

It was locked. He looked down, hesitating. There was another ledge below, but he wasn't sure he could make it. Instead, he went on to the next window.

Locked.

But the one after that was open. Gunther peered into the dimness. He could make out a bulky desk, and the glimmer of a telepanel. Sighing with relief, he crawled into the office, with another glance at his watch.

He went directly to the televisor and fingered a number. When a man's face appeared on the panel, Gunther merely said, "Reporting. O.K.," and broke the connection. His consciousness recorded a tiny click.

He called Ballard then, but the castle's secretary answered.

"Where's Ballard?"

"Not here, sir. Can I-"Gunther went white, remembering the click he had heard. He broke the connection experimentally, and heard it again. Ballard- "h.e.l.l!" Gunther said under his breath. He returned to the window, crawled out, hung by his hands, and let himself drop. He almost missed the ledge one story below. Skin ripped from his fingertips as he fought for a grip.

But he got it at last. He kicked his way through the window before him and dived in, gla.s.s showering. No televisor here. But there was a door dimly defined in the wall.

Gunther opened it, finding what he wanted on the other side. He switched on a lamp, riffling through the drawers till he was certain that this office wasn't another plant. After that, he used the televisor, fingering the same number he had called before.

There was no answer.

"Uh-huh," Gunther said, and made another call.

He had just broken the connection when a man in a surgeon's gown came in and shot him through the head.

The man who looked like Ffoulkes scrubbed make-up from his face. He glanced up when the physician entered. "O.K.?"

"Yeah. Let's go."

"Did they trace Gunther's call?"

"That's not our pie. Come on."

A gray-haired man, tied securely in his chair, swore as the hypodermic pierced his skin. Ballard waited a minute and then jerked his head at the two guards behind him.

"Get out."

They obeyed. Ballard turned to the prisoner.

"Gunther was supposed to report to you every day. If he failed, you were told to release a certain message he gave you. Where's the message?"

"Where's Gunther?" the gray-haired man said. His voice was thick, the words slurring as the scopolamin began its work.

"Gunther's dead. I arranged matters so that he'd telecall you on a tapped beam. I traced the call. Now where's the message?"

It took a little while, but at last Ballard unscrewed a hollow table leg and took out a thin roll of recording wire tape, carefully sealed.

"Know what's in this?"

"No. No. No-"

Ballard went to the door. "Kill him," he said to the guards, and waited till he heard the m.u.f.fled shot. Then he sighed with heartfelt relief. He was, at last, impregnable.Barney Ffoulkes called his chief of staff. "I hear Ballard's robot is finished. Clamp down. Put the squeeze on him. Force him to liquidate. Tell the Donner boys about the robot."

Dangerfield's face showed no expression as he made thumb and forefinger into a circle.

What Gunther had called Cain's thermodynamic patent was in reality something different, as the wire tape showed. Actually it was "McNamara, Torsion Process, Patent No. R-y35-V-22." Ballard recorded that in his capacious memory and looked up the patent himself. This time he wished to share the secret with no one. He was enough of a scientist, he thought, to be able to work out the details himself. Besides, Gunther's machines for diamond-making were already set up in the castle laboratory.

Ballard immediately ran into an annoying, though not serious, hitch. The original McNamara process was not designed to create artificial diamonds. It was a method of developing certain electronic alterations in matter, and through torsion changing the physical structure involved. Gunther had taken McNamara's system, applied it to carbon, and made diamonds.

Ballard felt certain he could do the same, but it would take time. As a matter of fact, it took exactly two weeks. Once the new application was discovered, the rest was incredibly easy. Ballard started to make diamonds.

There was one other difficulty. The annealing process took nearly a month. If the carbon was removed from the chamber before that time, it would be merely carbon. In the past, Gunther had kept a supply of diamonds on hand for emergencies; that supply was depleted now, most of the gems having gone to cover the golden robot. Ballard sat back and shrugged. In a month- Long before that Ffoulkes struck. He clamped down with both hands. Propaganda, whispering campaigns, releasing of new patents that rendered Ballard's worthless-all the weapons of economic warfare were unleashed against the diamond king. Holdings depreciated. There were strikes in Ballard's mines and factories. An unexpected civil war knocked the bottom out of certain African stocks he held.

Word began to go around that the Ballard empire was collapsing.

Margin was the answer-that, and security. Diamonds were excellent collateral. Ballard used up his small h.o.a.rd lavishly, trying to plug the leaks in the dike, buying on margin, using the tactics that had always succeeded for him in the past. His obvious confidence stemmed the tide for a while. Not for long.

Ffoulkes kept hitting, hard and fast.

By the end of the month, Ballard knew, he would have all the diamonds he needed, and could re-establish his credit. In the meantime- The Donner gang tried to steal Argus. They didn't know the robot's capabilities. Argus fled from room to room, clanging an alarm, ignoring bullets, until the Donners decided to give it up as a bad job and escape.

But by that time the police had arrived, and they failed.

Ballard had been too busy pulling strings to enjoy his golden plaything. The advent of the Donners gave him a new idea. It would be a shame to mar the robot, but the diamonds could be replaced later. And what good was a bank except for emergencies?

Ballard found a canvas bag and went into the robot's room, locking the doors behind him. Argus stood motionless in a corner, his diamond eyes inscrutable. Ballard took out a tiny chisel, shook his head rather sadly, and said in a firm voice, "What light through yonder window breaks-"

He finished the scrambled quotation and walked toward the robot. Argus silently went away.Ballard moved his shoulders impatiently. He repeated the key sentence louder. How many decibels were necessary? A good many- Argus still ran away. This time Ballard yelled the key at the top of his voice.

And the robot's flight mechanism continued to operate. The automatic alarm began to work. The siren screech hooted deafeningly through the room.

Ballard noticed that a little envelope was protruding from a slot in Argus' cuira.s.s. Automatically he reached for it-and the robot fled.

Ballard lost his temper and began to follow Argus around the room. The robot kept at a safe distance.

Eventually Argus, since he was untiring, won the race. Panting, Ballard unlocked the door and rang for help. The alarm siren died.

When servants came, Ballard ordered them to surround the robot. The circle of humanity closed in gradually, until Argus, unable to retreat within himself, chose the most logical solution and walked through the living wall, brushing the servants aside casually. He continued toward the door and through it, in a crackling of splintered mahogany panels. Ballard looked after the retreating figure without saying anything.

The envelope had been brushed free by the encounter with the door, and Ballard picked it up. The brief note inside read: Dear Bruce: I'm taking no chances. Unless I make a certain adjustment on Argus daily, he reverts to a different code phrase from the one you give him. Since I'm the only guy who knows that code, you'll have a sweet time catching Argus in case you cut my throat. Honesty is the best policy.

Love, Joe Gunther.

Ballard tore the note into tiny fragments. He dismissed the servants and followed the robot, who had become immobile in the next room.

He went out, after a while, and televised his divorced wife in Chicago.

"Jessie?"