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  “Don’t worry,” he laughed. “The worst I’ll do with the information is to blackmail you into taking me for a ride. I hope the Old Ma—Professor Maclaurin—doesn’t give you too rough a passage.”

  All three would have been quite surprised to know with what uncertainty the director himself was regarding this interview. In the ordinary way, such minor infractions of the rules as unauthorized used of a Caterpillar would have been a matter for Wagnall to deal with, but something more important was involved here. Until five minutes ago, he had no idea what it might be, and had asked to see Wheeler and Jamieson to discover what was going on. Professor Maclaurin prided himself on keeping in touch with everything, and a certain amount of his staff’s time and ingenuity had to be employed in seeing that he was not always successful.

  Wheeler, drawing heavily on the stock of good will N. Draconis had given him, gave an account of their unofficial mission. He tried to make it sound as if they were a pair of knights in armor riding out into the wilderness to discover the dragon which was menacing the Observatory. He concealed nothing of importance, which was well for him as the director already knew where he had been.

  As he listened to Wheeler’s account, Maclaurin found the pieces of the jigsaw fitting together. This mysterious message from Earth, ordering him to keep his people out of the Mare Imbrium in future, must have originated from the place these two had visited. The leak that Sadler was investigating would also have something to do with it. Maclaurin still found it hard to believe that any of his men was a spy, but he realized that a spy was the last thing any competent spy ever looked like.

  He dismissed Jamieson and Wheeler with an absent-minded mildness that left them both sorely puzzled. For a moment he sat lost in gloomy thought. It might be a coincidence, of course —the story hung together well. But if one of these men was after information, he had set about it in the right way. Or had he? Would a real spy have acted so openly, knowing that he was bound to draw suspicion on himself? Could it even be a daring double-bluff, on the principle that no one would seriously suspect such a frontal attack?

  Thank God, it wasn’t his problem. He would get it off his hands as quickly as he could. Professor Maclaurin snapped down the TRANSMIT switch and spoke to the outer office.

  “Please find Mr. Sadler for me. I want to speak to him again.”

  Chapter IX

  There had been a subtle change in Sadler’s status since the director’s return. It was something that Sadler had known must happen, though he had done his best to guard against it. On his arrival, he had been treated with polite suspicion by everybody, and it had taken him several days solid public-relations work to break down the barriers. People had become friendly and talkative, and he could make some headway. But now they seemed to be regretting their earlier frankness, and it was uphill work once more.

  He knew the reason. Certainly no one suspected his real purpose in being here, but everybody knew that the return of the director, far from limiting his activities, had somehow enhanced his position. In the echoing sounding-box of the Observatory, where rumor and gossip traveled at speeds scarcely inferior to that of light, it was hard to keep any secrets. The word must have gone out that Sadler was more important than he seemed. He only hoped it would be a long while before anybody guessed how much more important…

  Until now, he had confined his attention to the Administrative section. This was partly a matter of policy, because this would be the way he would be expected to act. But the Observatory really existed for the scientists, not the cooks, typists, accountants and secretaries, however essential they might be.

  If there was a spy in the Observatory, there were two main problems he had to face. Information is useless to a spy unless he can send it to his superiors. Mr. X must not only have contacts who passed material to him—he must have an out-going channel of communication as well.

  Physically, there were only three ways out of the Observatory. One could leave it by monorail, by tractor, or on foot. The last case did not seem very likely to be important. In theory, a man might walk a few kilometers and leave a message to be picked up at some prearranged rendezvous. But such peculiar behavior would soon be noticed, and it would be very easy to check on the small number of men in Maintenance who were the only people who used suits regularly. Every exit and entrance through the airlocks had to be logged, though Sadler doubted that this rule was invariably obeyed.

  The tractors were more promising, as they would give so much greater range. But their use would involve collusion, since they always carried a crew of at least two men—and this was one rule which was never broken, for safety reasons. There was the odd case of Jamieson and Wheeler, of course. Their backgrounds were being busily investigated now, and he should have the report in a few days. But their behavior, though irregular, had been too open to be really suspicious.

  That left the monorail to Central City. Everybody went there, on the average, about once a week. There were endless possibilities for the exchange of messages here, and at this very moment a number of “tourists” were inconspicuously checking contacts and making all sorts of interesting discoveries about the private lives of the Observatory staff. There was little part that Sadler could play in this work, except to furnish lists of the most frequent visitors to the City.

  So much for physical lines of communication. Sadler discounted them all. There were other, and subtler, means far more likely to be used by a scientist. Any member of the Observatory’s staff could build a radio transmitter, and there were countless places where one could be concealed. It was true that the patiently listening monitors had detected nothing, but sooner or later Mr. X would make a slip.

  Meanwhile, Sadler would have to find what the scientists were doing. The high-pressure course in astronomy and physics he had taken before coming here would be totally inadequate to give him any real understanding of the Observatory’s work, but at least he would be able to get the general outline. And he might eliminate a few suspects from his depressingly long list.

  The Computing Section did not detain him for long. Behind their glass panels, the spotless machines sat in silent cogitation while the girls fed the program tapes into their insatiable maws. In an adjacent sound-proofed room, the electric typewriters stormed away, printing endless rows and columns of numbers. Dr. Mays, the head of the section, did his best to explain what was going on—but it was a hopeless task. These machines had left far behind such elementary operations as integration, such kindergarten functions as cosines or logarithms. They were dealing with mathematical entities of which Sadler had never heard, and solving problems whose very statement would be meaningless to him.

  That did not worry him unduly; he had seen what he wanted to. All the main equipment was sealed and locked; only the maintenance engineers who called once a month could get at it. Certainly there was nothing for him here. Sadler tiptoed away as from a shrine.

  The optical workshop, where patient craftsmen shaped glass to a fraction of a millionth of an inch, using a technique unchanged for centuries, fascinated him but advanced his search no further. He peered at the interference fringes produced by clashing light waves, and watched them scurry madly back and forth as the heat of his body caused microscopic expansions in blocks of flawless glass. Here art and science met, to achieve perfections unmatched elsewhere in the whole range of human technology. Could there be any clue for him here in this buried factory of lenses, prisms and mirrors? It seemed most improbable.

  He was, Sadler thought glumly, rather in the position of a man in a darkened coal cellar, looking for a black cat that might not be there. What was worse, to make the analogy more accurate he would have to be a man who didn’t know what a cat looked like, even when he saw one.

  His private discussions with Maclaurin helped him a good deal. The director was still skeptical, but was obviously cooperating to the full if only to get this annoying interloper out of the way. Sadler could question him about any technical aspect of the Observatory’s
work, though he was careful not to give any hints as to the direction his search was taking him.

  He had now compiled a small dossier for every member of the staff—no mean achievement, even though the factual data had been supplied before he came to the Observatory. For most of his subjects, a single sheet of paper sufficed, but for some he had accumulated several pages of cryptic notes. The facts he was sure of he wrote in ink; the speculations were in pencil so that they could be modified when necessary. Some of these speculations were very wild and frequently libelous, and Sadler often felt very ashamed of them. It was hard, for example, to accept a drink from someone whom you had noted down as possibly susceptible to bribes owing to the cost of maintaining an expensive mistress in Central City…

  This particular suspect had been one of the engineers in Construction. Sadler had soon ruled him out as a likely candidate for blackmail, since far from concealing the situation the victim was always complaining bitterly about his inamorata’s extravagances. He had even warned Sadler against incurring similar liabilities.

  The filing system was divided into three parts. Section A contained the names of the ten or so men Sadler considered the most probable suspects, though there was not one against whom he had any real evidence. Some were down simply because they had the greatest opportunity for passing out information if they wished to do so. Wagnall was one of these; Sadler was practically certain that the secretary was innocent, but kept him on the list to be on the safe side.

  Several others were listed because they had close relatives in the Federation, or because they were too openly critical of Earth. Sadler did not really imagine that a well-trained spy would risk arousing suspicion by behaving in this way, but he had to be on the watch for the enthusiastic amateur who could be just as dangerous. The records of atomic espionage during the Second World War had been very instructive in this respect, and Sadler had studied them with great care.

  Another name on List A was that of Jenkins, the chief storekeeper. This was only the most tenuous of hunches, and all attempts by Sadler to follow it up had been unsuccessful. Jenkins seemed to be a somewhat morose individual, who resented interference and was not very popular with the rest of the staff. Getting anything out of him in the way of equipment was supposed to be the most difficult job on the Moon. This, of course, might merely mean that he was a good representative of his proverbially tenacious tribe.

  There remained that interesting couple Jamieson and Wheeler, who between them did a great deal to enliven the Observatory scene. Their drive out into the Mare Imbrium had been a fairly typical exploit, and had followed, so Sadler was assured, the pattern of earlier adventures.

  Wheeler was always the leading spirit. His trouble—if it was a trouble—was that he had too much energy and too many interests. He was not yet thirty; one day, perhaps, age and responsibility would mellow him, but so far neither had had much opportunity. It was too easy to dismiss him as a case of arrested development, as a college boy who had failed to grow up. He had a first-rate mind, and never did anything that was really foolish. Though there were many people who did not like him, particularly after they had been the victims of one of his practical jokes, there was nobody who wished him any harm. He moved unscathed through the little jungle of Observatory politics, and had the abiding virtues of complete honesty and forthrightness. One always knew what he was thinking, and it was never necessary to ask him for his opinion. He gave it first.

  Jamieson was a very different character, and presumably it was the contrast in their personalities which drew these two men together. He was older than Wheeler by a couple of years, and was regarded as a sobering influence on his younger companion. Sadler doubted this; as far as he could judge, Jamieson’s presence had never made any difference in his friend’s behavior. He had mentioned this to Wagnall, who had thought for a while and said, “Yes, but think how much worse Con would be if Sid wasn’t there to keep an eye on him.”

  Certainly Jamieson was far more stable and much harder to get to know. He was not as brilliant as Wheeler and would probably never make any shattering discoveries, but he would be one of those reliable, sound men who do the essential tidying up after the geniuses have broken through into new territory.

  Scientifically reliable—yes. Politically reliable—that was another matter. Sadler had tried to sound him, without making it too obvious, but so far with little success. Jamieson seemed more interested in his work and his hobby—the painting of lunar landscapes—than in politics. During his term at the Observatory he had built up a small art gallery, and whenever he had the chance he would go out in a spacesuit carrying easel and special paints made from low-vapor-pressure oils. It had taken him a good deal of experimenting to find pigments that could be used in a vacuum, and Sadler frankly doubted that the results were worth the trouble. He thought he knew enough about art to decide that Jamieson had more enthusiasm than talent, and Wheeler shared this point of view. “They say that Sid’s pictures grow on you after a while,” he had confided to Sadler. “Personally, I can think of no more horrible fate.”

  Sadler’s List B contained the names of everybody else in the Observatory who looked intelligent enough to be a spy. It was depressingly long, and from time to time he went through it trying to transfer people to List A or—better still—to the third and final list of those who were completely clear of suspicion. As he sat in his little cubicle, shuffling his sheets and trying to put himself into the places of the men he was watching, Sadler sometimes felt that he was playing an intricate game, in which most of the rules were flexible and all the players unknown. It was a deadly game, the moves were taking place at accelerating speed—and upon its outcome might depend the future of the human race.

  Chapter X

  The voice that came from the speaker was deep, cultured and sincere. It had been traveling across space for many minutes, beamed through the clouds of Venus along the two-hundred-million-kilometer link to Earth, thea relayed again from Earth to Moon. After that immense journey, it was still clear and clean, almost untouched by interference or distortion.

  “The situation here has hardened since my last commentary. No one in official circles will express any opinion, but the press and radio are not so reticent. I flew in from Hesperus this morning, and the three hours I’ve been here are quite long enough for me to gauge public opinion.

  “I must speak bluntly, even if I have to upset the people back home. Earth isn’t very popular here. The phrase ‘dog in the manger’ gets bandied around quite a lot. Your own supply difficulties are recognized, but it’s felt that the frontier planets are short of necessities while Earth wastes much of its resources on trivial luxuries. I’ll give you an example. Yesterday the news came in that the Mercury outpost has just lost five men through a faulty heat-exchange unit in one of the domes. The temperature control failed and the lava got them —not a very nice death. If the manufacturer had not been short of titanium, this wouldn’t have happened.

  “Of course, it’s not fair to blame Earth for this. But it’s unfortunate that only a week ago you cut the titanium quota again, and the interested parties here are seeing that the public doesn’t forget it. I can’t be more specific than that, because I don’t want to be cut off, but you’ll know who I mean.

  “I don’t believe that the situation will get any worse unless some new factor enters the picture. But suppose—and here I want to make it quite clear that I’m only considering a hypothetical case—suppose Earth were to locate new supplies of the heavy metals. In the still-unexplored ocean depths, for instance. Or even on the Moon, despite the disappointments it’s given in the past.

  “If this happens, and Earth tries to keep its discovery to itself, the consequences may be serious. It’s all very well to say that Earth would be within its rights. Legal arguments don’t carry much weight when you’re fighting thousand-atmosphere pressures on Jupiter, or trying to thaw out the frozen moons of Saturn. Don’t forget, as you enjoy your mild spring days and peaceful sum
mer evenings, how lucky you are to live in. the temperate region of the solar system, where the air never freezes and the rocks never melt…

  “What is the Federation likely to do if such a situation arises? If I knew, I couldn’t tell you. I can only make some guesses. To talk about war, in the old-fashioned sense, seems absurd to me. Either side could inflict heavy damage on the other, but any real trial of strength could not possibly be conclusive. Earth has too many resources, even though they are dangerously concentrated. And she owns most of the ships in the solar system.

  “The Federation has the advantage of dispersion. How can Earth carry out a simultaneous fight against half-a-dozen planets and moons, poorly equipped though they may be? The supply problem would be completely hopeless.

  “If, which heaven forbid, it should come to violence, we may see sudden raids on strategic points by specially equipped vessels which will make an attack and then retreat into space. Any talk of interplanetary invasion is pure fantasy. Earth certainly has no wish to take over the planets. And the Federation, even if it wanted to enforce its will on Earth, has neither the men nor the ships for a full-scale assault. As I see it, the immediate danger is that something like a duel may take place —where and how is anyone’s guess—as one side attempts to impress the other with its strength. But I would warn any who may be thinking of a limited, gentlemanly war that wars were seldom limited, and never gentlemanly. Good-by, Earth—this is Roderick Beynon, speaking to you from Venus.”

  Someone reached out and turned off the set, but at first nobody seemed inclined to start the inevitable discussion. Then Jansen, from Power, said admiringly:

  “Beynon’s got guts, you must admit. He wasn’t pulling his punches. I’m surprised they let him make that broadcast.”