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  “I’ve been asking a lot of people,” Jamieson replied. There was a wistfulness in his voice, the puzzled wonder of someone looking for guidance in a strange and complex world. “Do you remember that argument we had in the Common Room, when Mays said that whoever believed in ‘my planet, right or wrong’ was a fool?”

  “I remember,” Sadler answered cautiously.

  “I think Mays was right. Loyalty isn’t just a matter of birth, but ideals. There can be times when morality and patriotism clash.”

  “What’s started you philosophizing on these lines?”

  Jamieson’s reply was unexpected.

  “Nova Draconis,” he said. “We’ve just got in the reports from the Federation observatories out beyond Jupiter. They were routed through Mars, and someone there had attached a note to them—Molton showed it to me. It wasn’t signed, and it was quite short. It merely said that whatever happened—and the word was repeated twice—they’d see that their reports continued to reach us.”

  A touching example of scientific solidarity, thought Sadler; it had obviously made a deep impression on Jamieson. Most men—certainly most men who were not scientists—would have thought the incident rather trivial. But trifles like this could sway men’s minds at crucial moments.

  “I don’t know just what you deduce from this,” said Sadler, feeling like a skater on very thin ice. “After all, everybody knows that the Federation has plenty of men who are just as honest and well-intentioned and co-operative as anyone here. But you can’t run a solar system on gusts of emotion. Would you really hesitate if it came to a showdown between Earth and the Federation?”

  There was a long pause. Then Jamieson sighed. “I don’t know,” he answered. “I really don’t know.” It was a completely frank and honest answer. As far as Sadler was concerned, it virtually eliminated Jamieson from his list of suspects.

  The fantastic incident of the searchlight in the Mare Imbrium occurred nearly twenty-four hours later. Sadler heard about it when he joined Wagnall for morning coffee, as he usually did when he was near Administration.

  “Here’s something to make you think,” said Wagnall as Sadler walked into the secretary’s office. “One of the technicians from Electronics was up in the dome just now, admiring the view, when suddenly a beam of light shot up over the horizon. It lasted for about a second, and he says it was a brilliant blue-white. There’s no doubt that it came from that place that Wheeler and Jamieson visited. I know that Instrumentation has been having trouble with them, and I’ve just checked. Their magnetometers were kicked right off scale ten minutes ago, and there’s been a severe local ‘quake.’ ”

  “I don’t see how a searchlight would do that sort of thing,” answered Sadler, genuinely puzzled. Then the full implications of the statement reached him.

  “A beam of light?” he gasped. “Why, that’s impossible. It wouldn’t be visible in the vacuum here.”

  “Exactly,” said Wagnall, obviously enjoying the other’s mystification. “You can only see a light beam when it passes through something. And this was really brilliant—almost dazzling. The phrase Williams used was ‘it looked like a solid bar.’ Do you know what / think that place is ?”

  “No,” replied Sadler, wondering how near Wagnall had got to the truth. “I haven’t any idea.”

  The secretary looked rather bashful, as if trying out a theory of which he was a little ashamed.

  “I think it’s some kind of fortress. Oh, I know it sounds fantastic, but when you think about it, you’ll see it’s the only explanation that fits all the facts.”

  Before Sadler could reply, or indeed think of a suitable answer, the desk buzzer sounded and a slip of paper dropped out of Wagnall’s teleprinter. It was a standard Signals form, but there was one non-standard item about it. It carried the crimson banner of Priority.

  Wagnall read it aloud, his eyes widening as he did so.

  URGENT TO DIRECTOR PLATO OBSERVATORY DISMANTLE ALL SURFACE INSTRUMENTS AND MOVE ALL DELICATE EQUIPMENT UNDERGROUND COMMENCING WITH LARGE MIRRORS. RAIL SERVICE SUSPENDED UNTIL FURTHER NOTICE. KEEP STAFF UNDERGROUND AS FAR AS POSSIBLE. EMPHASIZE THIS PRECAUTIONARY REPEAT PRECAUTIONARY MEASURE. NO IMMEDIATE DANGER EXPECTED.

  “And that,” said Wagnall slowly, “appears to be that. I’m very much afraid my guess was perfectly correct.”

  It was the first time that Sadler had ever seen the entire Observatory staff gathered together. Professor Maclaurin stood on the raised dais at the end of the main lounge—the traditional place for announcements, musical recitals, dramatic interludes and other forms of Observatory entertainment. But no one was being entertained now.

  “I fully understand,” said Maclaurin bitterly, “what this means to your programs. We can only hope that this move is totally unnecessary, and that we can start work again within a few days. But obviously we can take no chances with our equipment—the five-hundred and the thousand-centimeter mirrors must be got under cover at once. I have no idea what form of trouble is anticipated, but it seems we are in an unfortunate position here. If hostilities do break out, I shall signal at once to both Mars and Venus reminding them that this is a scientific institution, that many of their nationals have been honored guests here, and that we are of no conceivable military importance. Now please assemble behind your group leaders, and carry out your instructions as swiftly and efficiently as possible.”

  The director walked down from the dais. Small though he was, he seemed still more shrunken now. In that moment, there was no one in the room who did not share his feelings, however much they might have inveighed against him in the past.

  “Is there anything I can do?” asked Sadler, who had been left out of the hastily drawn-up emergency plans.

  “Ever worn a spacesuit?” said Wagnall.

  “No, but I don’t mind trying.”

  To Sadler’s disappointment, the secretary shook his head firmly.

  “Too dangerous—you might get in trouble and there aren’t enough suits to go around, anyway. But I could do with some more help in the office—we’ve had to tear up all the existing programs and go over to a two-watch system. So all the rotas and schedules have to be rearranged—you could help on this.”

  That’s what comes of volunteering for anything, thought Sadler. But Wagnall was right; there was nothing he could do to help the technical teams. As for his own mission, he could probably serve it better in the secretary’s office than anywhere else, for it would be the operational headquarters from now on.

  Not, thought Sadler grimly, that it now mattered a great deal. If Mr. X had ever existed, and was still in the Observatory, he could now relax with the consciousness of a job well done.

  Some instruments, it had been decided, would have to take their chance. These were the smaller ones, which could be easily replaced. Operation Safeguard, as someone with a penchant for military nomenclature had christened it, was to concentrate on the priceless optical components of the giant telescopes and coelostats.

  Jamieson and Wheeler drove out with Ferdinand and collected the mirrors of the interferometer, the great instrument whose twin eyes, twenty kilometers apart, made it possible to measure the diameters of the stars. The main activity, however, centered round the thousand-centimeter reflector.

  Molton was in charge of the mirror team. The work would have been impossible without his detailed knowledge of the telescope’s optical and engineering features. It would have been impossible, even with his help, if the mirror had been cast in a single unit, like that of the historic instrument that still stood atop Mount Palomar. This mirror, however, was built from more than a hundred hexagonal sections, dovetailed together into a great mosaic. Each could be removed separately and carried to safety, though it was slow and tedious work and it would take weeks to reassemble the complete mirror with the fantastic precision needed.

  Spacesuits are not really designed for this sort of work, and one helper, through inexperience or haste, managed to drop his end of a mirror section as he lift
ed it out of the cell. Before anyone could catch it, the big hexagon of fused quartz had picked up enough speed to chip off one of its corners. This was the only optical casualty, which in the circumstances was very creditable.

  The last tired and disheartened men came in through the airlocks twelve hours after the operation had commenced. Only one research project continued—a single telescope was still following the slow decline of Nova Draconis as it sank toward final extinction. War or no war, this work would go on.

  Soon after the announcement that the two big mirrors were safe, Sadler went up to one of the observation domes. He did not know when he would have another chance to see the stars and the waning Earth, and he wished to carry the memory down into his subterranean retreat.

  As far as the eye could tell, the Observatory was quite unchanged. The great barrel of the thousand-centimeter reflector pointed straight to the zenith; it had been swung over to the vertical to bring the mirror cell down to ground level. Nothing short of a direct hit could damage this massive structure, and it would have to take its chances in the hours or days of danger that lay ahead.

  There were still a few men moving around in the open; one of them, Sadler noticed, was the director. He was perhaps the only man on the Moon who could be recognized when wearing a spacesuit. It had been specially built for him, and brought his height up to a full meter and a half.

  One of the open trucks used for moving equipment around the Observatory was scuttling across toward the telescope, throwing up little gouts of dust. It halted beside the great circular track on which the framework revolved, and the spacesuited figures clambered clumsily aboard. Then it made off briskly to the right, and disappeared into the ground as it descended the ramp leading into the airlocks of the garage.

  The great plain was deserted, the Observatory blind save for the one faithful instrument pointing toward the north in sublime defiance of the follies of man. Then the speaker of the ubiquitous public-address system ordered Sadler out of the dome, and he went reluctantly into the depths. He wished he could have waited a little longer, for in a few more minutes the western walls of Plato would be touched by the first fingers of the lunar dawn. It seemed a pity that no one would be there to greet it.

  Slowly the Moon was turning toward the sun, as it could never turn toward the Earth. The line of day was crawling across the mountains and plains, banishing the unimaginable cold of the long night. Already the entire westward wall of the Apennines was ablaze, and the Mare Imbrium was climbing into the dawn. But Plato still lay in darkness, lit only by the radiance of the waning Earth.

  A group of scattered stars suddenly appeared low down in the western sky. The tallest spires of the great ring-wall were catching the sun, and minute by minute the light spread down their flanks, until it linked them together in a necklace of fire. Now the sun was striking clear across the whole vast circle of the crater, as the ramparts on the east lifted into the dawn. Any watchers down on Earth would see Plato as an unbroken ring of light, surrounding a pool of inky shadow. It would be hours yet before the rising sun could clear the mountains and subdue the last strongholds of the night.

  There were no eyes to watch when, for the second time, that blue-white bar stabbed briefly at the southern sky. That was well for Earth. The Federation had learned much, but there were still some things which it might discover too late.

  Chapter XIV

  The Observatory had settled down for a siege of indefinite duration. It was not, on the whole, as frustrating an experience as might have been expected. Although the main programs had been interrupted, there was endless work to do in reducing results, checking theories, and writing papers, which until now had been put aside for lack of time. Many of the astronomers almost welcomed the break, and several fundamental advances in cosmology were a direct outcome of this enforced idleness.

  The worst aspect of the whole affair, everyone agreed, was the uncertainty and lack of news. What was really going on? Could one believe the bulletins from Earth, which seemed to be trying to soothe the public while at the same time preparing it for the worst ?

  As far as could be observed, some kind of attack was expected, and it was just the Observatory’s bad luck that it was so near a possible danger point. Perhaps Earth guessed what form the attack would take, and certainly it had made some preparations to meet it.

  The two great antagonists were circling each other, each unwilling to strike the first blow, each hoping to bluff the other into capitulation. But they had gone too far, and neither could retreat without a loss of prestige too damaging to be faced.

  Sadler feared that the point of no return had already been passed. He was sure of it when the news came over the radio that the Federation Minister at the Hague had delivered a virtual ultimatum to the government of Earth. It charged Earth with failing to meet its agreed quotas of heavy metals, of deliberately withholding supplies for political purposes, and of concealing the existence of new resources. Unless Earth agreed to discuss the allocation of these new resources, she would find it impossible to use them herself.

  The ultimatum was followed, six hours later, by a general broadcast to Earth, beamed from Mars by a transmitter of astonishing power. It assured the people of Earth that no harm would befall them, and that if any damage was done to the home planet it would be an unfortunate accident of war, for which their own government must take the blame. The Federation would avoid any acts which might endanger populated areas, and it trusted that its example would be followed.

  The Observatory listened to this broadcast with mixed feelings. There was no doubt as to its meaning, and no doubt that the Mare Imbrium was, within the meaning of the Act, an unpopulated area. One effect of the broadcast was to increase sympathy for the Federation, even among those likely to be damaged by its actions. Jamieson in particular began to be much less diffident in expressing his views, and had soon made himself quite unpopular. Before long, indeed, a distinct rift appeared in the Observatory ranks. On the one side were those (mostly the younger men) who felt much as Jamieson did, and regarded Earth as reactionary and intolerant. Against them, on the other hand, were the steady, conservative individuals who would always automatically support those in authority without worrying too much about moral abstractions.

  Sadler watched these arguments with great interest, even though he was conscious that the success or failure of his mission had already been decided and that nothing he could do now would alter that. However, there was always the chance that the probably mythical Mr. X might now become careless, or might even attempt to leave the Observatory. Sadler had taken certain steps to guard against this, with the co-operation of the director. No one could get at the spacesuits or tractors without authority, and the base was therefore effectively sealed. Living in a vacuum did have certain advantages from the Security point of view.

  The Observatory’s state of siege had brought Sadler one tiny triumph, which he could very well have forgone and which seemed an ironic commentary on all his efforts. Jenkins, his suspect from the Stores Section, had been arrested in Central City. When the monorail service had been suspended, he had been in town On very unofficial business, and had been picked up by the agents who had been watching him as a result of Sadler’s hunch.

  He had been scared of Sadler, and with good reason. But he had never betrayed any state secrets, for he had never possessed any. Like a good many storekeepers before him, he had been busy selling government property.

  It was poetic justice. Jenkins’ own guilty conscience had caught him. But though Sadler had eliminated one name from his list, the victory gave him very little satisfaction indeed.

  The hours dragged on, with tempers getting more and more frayed. Overhead, the sun was now climbing up the morning sky and had now lifted well above the western wall of Plato. The initial sense of emergency had worn off, leaving only a feeling of frustration. One misguided effort was made to organize a concert, but it failed so completely that it left everyone more depressed than before.r />
  Since nothing seemed to be happening, people began to creep up to the surface again, if only to have a look at the sky and to reassure themselves that all was still well. Some of these clandestine excursions caused Sadler much anxiety, but he was able to convince himself that they were quite innocent. Eventually the director recognized the position, by permitting a limited number of people to go up to the observation domes at set hours of the day.

  One of the engineers from Power organized a sweepstake, the prizewinner to be the person who guessed how long this peculiar siege was going to last. Everybody in the Observatory contributed, and Sadler—acting on a very long shot—read the lists thoughtfully when they were complete. If there was anyone here who happened to know what the right answer might be, he would take care to avoid winning. That, at least, was the theory. Sadler learned nothing from his study, and finished it wondering just how tortuous his mental processes were becoming. There were times when he feared that he would never be able to think in a straightforward fashion again.

  The waiting ended just five days after the Alert. Up on the surface, it was approaching noon, and the Earth had waned to a thin crescent too close to the sun to be looked at with safety. But it was midnight by the Observatory clocks, and Sadler was sleeping when Wagnall unceremoniously entered his room.

  “Wake up!” he said, as Sadler rubbed the sleep from his eyes. “The director wants to see you!” Wagnall seemed annoyed at being used as a messenger boy. “There’s something going on,” he complained, looking at Sadler suspiciously. “He won’t even tell me what it’s all about!”

  “I’’m not sure that I know either,” Sadler replied as he climbed into his dressing gown. He was telling the truth, and on the way to the director’s office speculated sleepily on all the things that could possibly have happened.

  Professor Maclaurin, thought Sadler, had aged a good deal in the last few days. He was no longer the brisk, forceful little man he had been, ruling the Observatory with a rod of iron. There was even a disorderly pile of documents at the side of his once-unsullied desk.