'I don't know. Broken leg, I think. It's - hot.' There was a long pause. Then: 'I think my cooler's gone out.'

The Major shot me a glance, then turned to Stone. 'Get a cable from the second sledge fast. He'll fry alive if we don't get him out of there. Peter, I need you to lower me. Use the tractor winch.'

I lowered him; he stayed down only a few moments. When I hauled him up, his face was drawn. 'Still alive,' he panted. 'He won't be very long, though.' He hesitated for just an in-stant. 'We've got to make a try.'

'I don't like this ledge,' I said. 'It's moved twice since I got out. Why not back off and lower him a cable?'

'No good. The Bug is smashed and he's inside it. We'll need torches and I'll need one of you to help.' He looked at me and then gave Stone a long look. 'Peter, you'd better come.'

'Wait,' said Stone. His face was very white. 'Let me go down with you.'

'Peter is lighter.'

'I'm not so heavy. Let me go down.'

'Okay, if that's the way you want it.' The Major tossed him a torch. 'Peter, check these hitches and lower us slowly. If you see any kind of trouble, anything, cast yourself free and back off this thing, do you understand? This whole ledge may go.'

I nodded. 'Good luck.'

They went over the ledge. I let the cable down bit by bit until it hit two hundred feet and slacked off.

'How does it look?' I shouted.

'Bad,' said the Major. 'We'll have to work fast. This whole side of the creva.s.se is ready to crumble. Down a little more.'

Minutes pa.s.sed without a sound. I tried to relax, but I couldn't. Then I felt the ground shift, and the tractor lurched to the side.

The Major shouted, 'It's going, Peter - pull back!' and I threw the tractor into reverse, jerked the controls as the tractor rumbled off the shelf. The cable snapped, coiled up in front like a broken clockspring. The whole surface under me was shaking wildly now; ash rose in huge gray clouds. Then, with a roar, the whole shelf lurched and slid sideways. It teetered on the edge for seconds before it crashed into the creva.s.se, tearing the side wall down with it in a mammoth slide. I jerked the tractor to a halt as the dust and flame billowed up.

They were gone - all three of them, McIvers and the Major and Jack Stone - buried under a thousand tons of rock and zinc and molten lead. There wasn't any danger of anybody ever finding their bones.

Peter Clancy leaned back, finishing his drink, rubbing his scarred face as he looked across at Baron.

Slowly, Baron's grip relaxed on the chair arm. 'You got back,' he said.

Clancy nodded. 'I got back, sure. I had the tractor and the sledges. I had seven days to drive back under that yellow Sun. I had plenty of time to think.'

'You took the wrong man along,' Baron said. 'That was your mistake. Without him you would have made it.'

'Never.' Clancy shook his head. 'That's what I was thinking the first day or so - that it was McIvers' fault, that he was to blame. But that isn't true. He was wild, reckless and had lots of nerve.'

'But his judgement was bad!'

'It couldn't have been sounder. We had to keep to our schedule even if it killed us, because it would positively kill us if we didn't.'

'But a man like that-'

'A man like Mclvers was necessary. Can't you see that? It was the Sun that beat us, that surface. Perhaps we were licked the very day we started.' Clancy leaned across the table, his eyes pleading. 'We didn't realize that, but it was true. There are places that men can't go, conditions men can't tolerate. The others had to die to learn that.

I was lucky, I came back. But I'm trying to tell you what I found out - that n.o.body will ever make a Brightside Crossing.'

'We will,' said Baron. 'It won't be a picnic, but we'll make it.'

'But suppose you do,' said Clancy, suddenly. 'Suppose I'm all wrong, suppose you do make it. Then what? What comes next?'

'The Sun,' said Baron.

Clancy nodded slowly. 'Yes. That would be it, wouldn't it?' He laughed. 'Good-by, Baron. Jolly talk and all that. Thanks for listening.'

Baron caught his wrist as he started to rise. 'Just one ques-tion more, Clancy. Why did you come here?'

'To try to talk you out of killing yourself,' said Clancy.

'You're a liar,' said Baron.

Clancy stared down at him for a long moment. Then he crumpled in the chair.

There was defeat in his pale blue eyes and something else.

'Well?'

Peter Clancy spread his hands, a helpless gesture. 'When do you leave, Baron? I want you to take me along.'

The Sack was the System's most valuable possession - or else the most serious menace. It could correctly answer any question, and the answers were frequently the wrong ones. And anything like that was an impossibly explosive situation!

THE SACK.

By William Morrison At first they hadn't even known that the Sack existed. If they had noticed it at all when they landed on the asteroid, they thought of it merely as one more outpost of rock on the barren expanse of roughly ellipsoidal silicate surface, which Captain Ganko noticed had major and minor axes roughly three and two miles in diameter respectively. It would never have entered any one's mind that the unimpressive object they had unconsciously acquired would soon be regarded as the most valuable prize in the System.

The landing had been accidental. The Government Patrol ship had been limping along, and now it had settled down for repairs, which would take a good seventy hours. Fortunately, they had plenty of air, and their recirculation system worked to perfection. Food was in somewhat short supply, but it didn't worry them, for they knew that they could always tighten their belts and do without full rations for a few days. The loss of water that had resulted from a leak in the storage tanks, however, was a more serious matter. It occupied a good part of their conversation during the next fifty hours.

Captain Ganko said finally, 'There's no use talking, it won't be enough. And there are no supply stations close enough at hand to be of any use. We'll have to radio ahead and hope that they can get a rescue ship to us with a reserve supply.'

The helmet mike of his next in command seemed to droop. 'It'll be too bad if we miss each other in s.p.a.ce, captain.'

Captain Ganko laughed unhappily. 'It certainly will. In that case we'll have a chance to see how we can stand a little de-hydration.'

For a time n.o.body said anything. At last, however, the Second Mate suggested, 'There might be water somewhere on the asteroid, sir.'

'Here? How in Pluto would it stick, with a gravity that isn't even strong enough to hold loose rocks? And where the devil would it be?'

'To answer the first question first, it would be retained as water of crystallization,'

replied a soft liquid voice that seemed to penetrate his s.p.a.cesuit and come from behind him. 'To answer the second question, it is half a dozen feet below the surface, and can easily be reached by digging.'

They had all swiveled around at the first words. But no one was in sight in the direction from which the words seemed to come. Captain Ganko frowned, and his eyes narrowed danger-ously. 'We don't happen to have a practical joker with us, do we?' he asked mildly.

'You do not,' replied the voice.

'Who said that?'

'I, Yzrl.'

A crewman became aware of something moving on the sur-face of one of the great rocks, and pointed to it. The motion stopped when the voice ceased, but they didn't lose sight of it again. That was how they learned about Yzrl, or as it was more often called, the Mind-Sack.

If the ship and his services hadn't both belonged to the Govern-ment, Captain Ganko could have claimed the Sack for himself or his owners and retired with a wealth far beyond his dreams. As it was, the thing pa.s.sed into Government control.

Its im-portance was realized almost from the first, and Jake Siebling had reason to be proud when more important and more in-fluential figures of the political and industrial world were finally pa.s.sed over and he was made Custodian of the Sack.

Siebling was a short, stocky man whose one weakness was self-deprecation. He had carried out one difficult a.s.signment after another and allowed other men to take the credit. But this job was not one for a blowhard, and those in charge of making the appointment knew it. For once they looked beyond credit and superficial reputation, and chose an individual they disliked somewhat, but trusted absolutely. It was one of the most effective tributes to honesty and ability ever devised.

The Sack, as Siebling learned from seeing it daily, rarely deviated from the form in which it had made its first appear-ance - a rocky, grayish lump that roughly resembled a sack of potatoes. It had no features, and there was nothing, when it was not being asked questions, that might indicate that it had life. It ate rarely - once in a thousand years, it said, when left to itself; once a week when it was pressed into steady use. It ate or moved by fashioning a suitable pseudopod, and stretch-ing the thing out in whatever way it pleased. When it had attained its objective, the pseudopod was withdrawn into the main body again, and the creature became once more a potato sack.

It turned out later that the name, 'Sack', was well chosen from another point of view, in addition to that of appearance. For the Sack was stuffed with information, and beyond that, with wisdom. There were many doubters at first, and some of them retained their doubts to the very end, just as some people remained convinced hundreds of years after Columbus that the Earth was flat. But those who saw and heard the Sack had no doubts at all. They tended, if anything, to go too far in the other direction, and to believe that the Sack knew everything. This, of course, was untrue.

It was the official function of the Sack, established by a series of Interplanetary Acts, to answer questions. The first questions, as we have seen, were asked accidentally, by Cap-tain Ganko. Later they were asked purposefully, but with a purpose that was itself random, and a few politicians managed to acquire considerable wealth before the Government put a stop to the leak of information, and tried to have the questions asked in a more scientific and logical manner.

Question time was rationed for months in advance, and sold at what was, all things considered, a ridiculously low rate - a mere hundred thousand credits a minute. It was this unre-stricted sale of time that led to the first great Government squabble.

It was the unexpected failure of the Sack to answer what must have been to a mind of its ability an easy question that led to the second blow-up, which was fierce enough to be called a crisis. A total of a hundred and twenty questioners, each of whom had paid his hundred thousand, raised a howl that could be heard on every planet, and there was a legislative investigation, at which Siebling testified, and all the conflicts were aired.

He had left an a.s.sistant in charge of the Sack, and now, as he sat before the Senatorial Committee, he twisted uncomfort-ably in front of the battery of cameras.

Senator Horrigan, his chief interrogator, was a bluff, florid, loud-mouthed politician who had been able to imbue him with a feeling of guilt even as he told his name, age, and length of government service.

'It is your duty to see to it that the Sack is maintained in proper condition for answering questions, is it not, Mr. Siebling?' demanded Senator Horrigan.

'Yes, sir.'

'Then why was it incapable of answering the questioners in question? These gentlemen had honestly paid their money - a hundred thousand credits each. It was necessary, I under-stand, to refund the total sum. That meant an overall loss to the Government of, let me see, now - one hundred twenty at one hundred thousand each - one hundred and twenty million credits,' he shouted, rolling the words.

'Twelve million, senator,' hastily whispered his secretary.

The correction was not made, and the figure was duly head-lined later as one hundred and twenty million.

Siebling said, 'As we discovered later, senator, the Sack failed to answer questions because it was not a machine, but a living creature. It was exhausted. It had been exposed to questioning on a twenty-four-hour-a-day basis.'

'And who permitted this idiotic procedure?' boomed Sena-tor Horrigan.

'You yourself, senator,' said Siebling happily. 'The pro-cedure was provided for in the bill introduced by you and approved by your committee.'

Senator Horrigan had never even read the bill to which his name was attached, and he was certainly not to blame for its provisions. But this private knowledge of his own innocence did him no good with the public. From that moment he was Siebling's bitter enemy.

'So the Sack ceased to answer questions for two whole hours?'

'Yes, sir. It resumed only after a rest.'

'And it answered then without further difficulty?'

'No, sir. Its response was slowed down. Subsequently questioners complained that they were defrauded of a good part of their money. But as answers mere given, we considered that the complaints were without merit, and the financial de-partment refused to make refunds.'

'Do you consider that this cheating of investors in the Sack's time is honest?'

'That's none of my business, senator,' returned Siebling, who had by this time got over most of his nervousness. 'I merely see to the execution of the laws. I leave the question of honesty to those who make them. I presume that it's in perfectly good hands.'

Senator Horrigan flushed at the laughter that came from the onlookers. He was personally unpopular, as unpopular as a politician can be and still remain a politician. He was disliked even by the members of his own party, and some of his best political friends were among the laughers. He decided to abandon what had turned out to be an unfortunate line of questioning.

'It is a matter of fact, Mr. Siebling, is it not, that you have frequently refused admittance to investors who were able to show perfectly valid receipts for their credits?'

'That is a fact, sir. But-'

'You admit it, then.'

'There is no question of "admitting" anything, senator. What I meant to say was-'

'Never mind what you meant to say. It's what you have already said that's important. You've cheated these men of their money!'

'That is not true, sir. They were given time later. The reason for my refusal to grant them admission when they asked for it was that the time had been previously reserved for the Armed Forces. There are important research questions that come up, and there is, as you know, a difference of opinion as to priority. When confronted with requisitions for time from a commercial investor and a representative of the Govern-ment, I never took it upon myself to settle the question.

I always consulted with the Government's legal adviser.'

'So you refused to make an independent decision, did you?'

'My duty, senator, is to look after the welfare of the Sack. I do not concern myself with political questions. We had a moment of free time the day before I left the asteroid, when an investor who had already paid his money was delayed by a s.p.a.ce accident, so instead of letting the moment go to waste, I utilized it to ask the Sack a question.'

'How you might advance your own fortunes, no doubt?'

'No, sir. I merely asked it how it might function most efficiently. I took the precaution of making a recording, know-ing that my word might be doubted. If you wish, senator, I can introduce the recording in evidence.'

Senator Horrigan grunted, and waved his hand. 'Go on with your answer.'

"The Sack replied that it would require two hours of com-plete rest out of every twenty, plus an addition hour of what it called, "recreation". That is, it wanted to converse with some human being who would ask what it called sensible questions, and not press for a quick answer.'

'So you suggest that the Government waste three hours of every twenty - one hundred and eighty million credits?'

'Eighteen million,' whispered the secretary.

'The time would not be wasted. Any attempt to overwork the Sack would result in its premature annihilation.'

'That is your idea, is it?'

'No, sir, that is what the Sack itself said.'

At this point, Senator Horrigan swung into a speech of de-nunciation, and Siebling was excused from further testimony. Other witnesses were called, but at the end the Senate Investi-gating body was able to come to no definite conclusion, and it was decided to interrogate the Sack personally.

It was out of the question for the Sack to come to the Senate, so the Senate quite naturally came to the Sack. The Committee of Seven was manifestly uneasy as the senatorial ship deceler-ated and cast its grapples toward the asteroid. The members, as individuals, had all traveled in s.p.a.ce before, but all their previous destinations had been in civilized territory, and they obviously did not relish the prospect of landing on this airless and sunless body of rock.

The televisor companies were alert to their opportunity, and they had acquired more experience with desert territory. They had disembarked and set up their apparatus before the sena-tors had taken their first timid steps out of the safety of their ship.