"That pattern of human conduct which is loosely called 'self-respecting' has the curious property of restricting to the individual, through his withdrawal of acts to communicate misfortune, the unfavorable chance occurrences which probability insists must take place. On the other hand, the same pattern of human conduct tends to disseminate and to share chance favorable occurrences among the group. The members of a group of persons practicing 'self-respect,' then, increase the mathematical probability of cultures in which principles leading to this type of behavior become obsolete. A decadent society brings bad luck upon itself by the operation of the laws of probability . . ."
Probability and Human Conduct—Fitzgerald
She came very slowly back to consciousness. It was almost as if she waked from utterly exhausted sleep. When she first opened her eyes, they wandered vaguely until they fell upon Calhoun. Then a bitter and contemptuous hatred filled them. Her hand fumbled weakly to the knife at her waist. It was not a good weapon. It had been table cutlery, and the handle was much too slender to permit a grip by which somebody could be killed. Calhoun bent over and took the knife away from her. It had been ground unskillfully to a point.
"In my capacity as your doctor," he told her, "I must forbid you to stab me. It wouldn't be good for you." Then he said, "Look, my name's Calhoun. I came from Sector Med Headquarters to make a planetary health inspection here, and some lads in the city apparently didn't want a Med Ship aground. So they tried to kill me by battering me all over the walls of my ship with the landing-grid field. I made what was practically a crash landing, and now I need to know what's up."
The burning hatred remained in her eyes, but there was a trace of doubt.
"Here," said Calhoun, "is my identification."
He showed her the highly official documents which gave him vast authority—where a planetary government was willing to concede it.
"Of course," he added, "papers can be stolen. But I have a witness that I'm what and who I say I am. You've heard of tormals? Murgatroyd will vouch for me."
He called his small and furry companion. Murgatroyd advanced and politely offered a small, prehensile paw. He said "Chee" in his shrill voice, and then solemnly took hold of the girl's wrist in imitation of Calhoun's previous action of feeling her pulse.
Calhoun watched. The girl stared at Murgatroyd. But all the galaxy had heard of tormals. They'd been found on a planet in the Deneb region, and they were engaging pets and displayed an extraordinary immunity to the diseases men were apt to scatter in their interstellar journeying. A forgotten Med Service researcher made an investigation of the ability of tormals to live in contact with men. He came up with a discovery which made them very much too valuable to have their lives wasted in mere sociability. There were still not enough of Murgatroyd's kind to meet the need that men had of them, and laymen had to forego their distinctly charming society. So Murgatroyd was an identification.
The girl said faintly, "If you'd only come earlier . . . but it's too late now. I—I thought you came from the city."
"I was headed there," said Calhoun.
"They'll kill you."
"Yes," agreed Calhoun, "they probably will. But right now you're ill and I'm Med Service. I suspect there's been an epidemic of some disease here, and that for some reason the people in the city don't want the Med Service to know about it. You seem to have it, whatever it is. Also, that was a very curious weapon you shot me with."
The girl said drearily, "One of our group had made a hobby of such things. Ancient weapons. He had bows and arrows and—what I shot you with was a crossbow. It doesn't need power. Not even chemical explosives. So when we ran away from the city, he ventured back in and armed us as well as he could."
Calhoun nodded. A little irrelevant talk is always useful at the beginning of a patient interview. But what she said was not irrelevant. A group of people had fled the city. They'd needed arms, and one of their number had gone back into the city for them. He'd known where to find reconstructions of ancient lethal devices—a hobby collection. It sounded like people of the civil service type. Of course there were no longer social classes separated by income. Not on most worlds, anyhow. But there were social groupings based on similar tastes, which had led to similar occupations and went on to natural congeniality. Calhoun placed her now. He remembered a long-outmoded term, "upper middle class," which no longer meant anything in economics but did in medicine.
"I'd like a case history," he said conversationally. "Name?"
"Helen Jons," she said wearily.
He held the mike of his pocket recorder to pick up her answers. Occupation: statistician. She'd been a member of the office force which was needed during the building of the city. When the construction work was finished, most of the workmen returned to the mother world Dettra, but the office staff stayed on to organize things when the colonists arrived.
"Hold it," said Calhoun. "You were a member of the office staff who stayed in the city to wait for the colonists. But a moment ago you said you fled from the city. There are still some people there, at least around the landing grid. I've reason to be sure of it. Were they part of the office staff too? If not, where did they come from?"
She shook her head weakly.
"Who are they?" he repeated.
"I don't know," she said drearily. "They came after the plague."
"Oh," said Calhoun. "Go on. When did the plague turn up? And how?"
She continued in a feeble voice. The plague appeared among the last shipload of workmen waiting to be returned to the mother world. There were then about a thousand people in the city, of all classes and occupations. The disease appeared first among those who tended the vast fields of planted crops.
It was well established before its existence was suspected. There were no obvious early symptoms, but those affected felt a loss of energy and they became listless and lackadaisical. The listlessness showed first in a cessation of griping and quarreling among the workmen. Norman, healthy human beings are aggressive. They squabble with each other as a matter of course. But squabbling ceased. Men hadn't the energy for it.
Shortness of breath appeared later. It wasn't obvious, at first. Men who lacked energy to squabble wouldn't exert themselves and so get out of breath. It was one of the medical staff who drove himself impatiently in spite of what he thought was a transient weariness, and discovered himself gasping without cause. He took a metabolism test, suspicious because the symptoms were so extreme. His metabolic rate was astonishingly low.
"Hold it again," commanded Calhoun. "You're a statistician, but you're talking medical talk. How's that?"
"Kim," the girl said tiredly. "He was on the medical staff. I was—I was going to marry him."
Calhoun nodded. "Go on."
She seemed to need to gather strength even to talk. She did not go on. Shortness of breath among the plague victims was progressive. Presently they gasped horribly from the exertion of getting to their feet, even. Walking, however slowly, could be done only at the cost of panting for breath. After a certain time they simply lay still. They could not summon the energy to stir. Then they sank into unconsciousness and died.
"What did the doctors think about all this?" demanded Calhoun.
"Kim could tell you," said the girl exhaustedly. "The doctors worked frantically. They tried everything—everything! They could get the symptoms in experimental animals, but they couldn't isolate the germ or whatever it was that caused the disease. Kim said they couldn't get a pure culture. It was incredible. No technique would isolate the cause of the symptoms, and yet the plague was contagious. Terribly so!"
Calhoun scowled. A new pathogenic mechanism was always possible, but it was at least unlikely. Still, something that standard bacteriological methods couldn't track down was definitely a job for the Med Service. But there were people in the city who didn't want the Med Service to interfere. The girl had referred to them once, when she spoke of a flight from the city, and again when she said someone ventured back for weapons. And she'd used a weapon on him, thinking him from the city. The description of the plague, too, was remarkable.
It was able to hide from men, which was something no other microorganism could accomplish. It was an ability that would offer no advantage to a disease germ in a state of purely natural happenings. Disease germs do not encounter bacteriological laboratories, as a rule, often enough to need to adapt to escape them. It would not help an average germ or microbe to be invisible to an electron microscope. There would be no reason for such invisibility to be developed.
But more than that, why should anybody want to keep a Med Service man like Calhoun from investigating a plague? When infected people fled from the city to die in the wilds, why should people remaining in the city try to destroy a Med Ship which might help to end the deaths? Ordinarily, well people in the middle of an epidemic are terrified lest they catch it. They'd be as anxious for Med Service help as those already infected. What was going on here?
"You said about a thousand people were in the city," observed Calhoun. "They tended the crops and waited for the city's permanent inhabitants. What happened after the plague was recognized to be one?"
"The first shipload of emigrants came from Dettra Two," said the girl hopelessly. "We didn't bring them to ground with the landing grid. Instead, we described the plague. We warned them away. We quarantined ourselves while our doctors tried to fight the disease. The shipload of new people went back to Dettra without landing."
Calhoun nodded. This would be normal.
"Then another ship came. There were maybe two hundred of us left alive. More than half of us already showed signs of the plague. This other ship came. It landed on emergency rockets because we had nobody left who knew how to work the grid."
Then her voice wavered a little as she told of the landing of the strange ship in the landing grid of the city that was dying without ever having really lived. There was no crowd to meet the ship. Those people who were not yet stricken had abandoned the city and scattered themselves widely, hoping to escape contagion by isolating themselves in new and uncontaminated dwelling units. But there was no lack of communication facilities. Nearly all the survivors watched the ship come down through vision screens in the control building of the then-useless grid.
The ship touched ground. Men came out. They did not look like doctors. They did not act like them. The vision screens in the control building were snapped off immediately. Contact could not be restored. So the isolated groups spoke agitatedly to each other by vision screen. They exchanged messages of desperate hope. Then, newly landed men appeared at an apartment whose occupant was in the act of such a conversation with a group in a distant building. He left the visiphone on as he went to admit and greet the men he hoped were researchers, at least, come to find the cause of the plague and end it.
The viewers at the other visiphone plate gazed eagerly into his apartment. They saw the group of newcomers enter. They saw them deliberately murder their friend and the survivors of his family.
Plague-stricken or merely terrified people—in pairs or trios widely separated through the city—communicated in swift desperation. It was possible that there had been a mistake, a blunder, and an unauthorized crime had been committed. But it was not a mistake. Unthinkable as such an idea was, there developed proof that the plague on Maris III was to be ended as if it were an epizootic among animals. Those who had it and those who had been exposed to it were to be killed to prevent its spread among the newcomers.
A conviction of such horror could not be accepted without absolute proof. But when night fell, the public power supply of the city was cut off and communications ended. The singular sunset hush of Maris III left utter stillness everywhere—except for the screams which echoed among the city's innumerable empty-eyed, unoccupied buildings.
The scant remainder of the plague survivors fled in the night. They fled singly and in groups, carrying the plague with them. Some carried members of their families who were too weak to walk. Others helped already-doomed wives or friends or husbands to the open country. Flight would not save their lives. It would only prevent their murder. But somehow that seemed a thing to be attempted.
"This," said Calhoun, "is not a history of your own case. When did you develop the disease, whatever it may be?"
"Don't you know what it is?" asked Helen hopelessly.
"Not yet," admitted Calhoun. "I've very little information. I'm trying to get more."
He did not mention the information gathered from a dead man in a corn field some miles away.
The girl told of her own case. The first symptom was listlessness. She could pull out of it by making an effort, but it progressed. Day by day more urgent, more violent effort was needed to pay attention to anything, and she noted greater weakness when she tried to act. She felt no discomfort, not even hunger or thirst. She'd had to summon increasing resolution even to become aware of the need to do anything at all.
The symptoms were singularly like those of a man too long at too high an altitude without oxygen. They were even more like those of a man in a non-pressurized flier, whose oxygen supply was cut off. Such a man would pass out without realizing that he was slipping into unconsciousness, only it would happen in minutes. Here the process was infinitely gradual. It was a matter of weeks. But it was the same thing.
"I'd been infected before we ran away," said Helen drearily. "I didn't know it then. Now I know I've a few more days of being able to think and act, if I try hard enough. But it'll be less and less each day. Then I'll stop being able to try."
Calhoun watched the tiny recorder roll its multiple-channel tape from one spool to the other as she talked.
"You had energy enough to try to kill me," he observed.
He looked at the weapon. There was an arched steel spring placed crosswise at the end of a barrel like a sporting blast-gun. Now he saw a handle and a ratchet by which the spring was brought to tension, storing up power to throw the missile. He asked, "Who wound up this crossbow?"
Helen hesitated. "Kim—Kim Walpole," she said finally.
"You're not a solitary refugee now? There are others of your group still alive?"
She hesitated again, and then said, "Some of us came to realize that staying apart didn't matter. We couldn't hope to live anyhow. We already had the plague. Kim is one of us. He's the strongest. He wound up the crossbow for me. He had the weapons to begin with."
Calhoun asked seemingly casual questions. She told him of a group of fugitives remaining together because all were already doomed. There had been eleven of them. Two were dead now. Three others were in the last lethargy. It was impossible to feed them. They were dying. The strongest was Kim Walpole, who'd ventured back into the city to bring out weapons for the rest. He'd led them, and now was still the strongest and—so the girl considered—the wisest of them all.
They were waiting to die. But the newcomers to the planet—the invaders, they believed—were not content to let them wait. Groups of hunters came out of the city and searched for them.
"Probably," said the girl dispassionately, "to burn our bodies against contagion. They kill us so they won't have to wait. And it just seemed so horrible that we felt we ought to defend our right to die naturally. That's why I shot at you. I shouldn't have, but . . ."
She stopped helplessly. Calhoun nodded.
The fugitives now aided each other simply to avoid murder. They gathered together exhaustedly at nightfall, and those who were strongest did what they could for the others. By day, those who could walk scattered to separate hiding places, so that if one was discovered, the others might still escape the indignity of being butchered. They had no stronger motive than that. They were merely trying to die with dignity, instead of being killed as sick beasts. Which bespoke a tradition and an attitude that Calhoun approved. People like these would know something of the science of probability in human conduct. Only they would call it ethics. But the strangers—the invaders—were of another type. They probably came from another world.
"I don't like this," said Calhoun coldly. "Just a moment."
He went over to Murgatroyd. Murgatroyd seemed to droop a little. Calhoun checked his breathing and listened to his heart. Murgatroyd submitted, saying only "Chee" when Calhoun put him down.
"I'm going to help you to your rendezvous," said Calhoun abruptly. "Murgatroyd's got the plague now. I exposed him to it, and he's reacting fast. And I want to see the others of your group before nightfall."
The girl just managed to get to her feet. Even speaking had tired her, but she gamely though wearily moved off at a slant to the hillside's slope. Calhoun picked up the odd weapon and examined it thoughtfully. He wound it up as it was obviously meant to be. He picked up the missile it had fired, and put it in place. He went after the girl, carrying it. Murgatroyd brought up the rear.
Within a quarter of a mile the girl stopped and clung swaying to the trunk of a slender tree. It was plain that she had to rest, and dreaded getting off her feet because of the desperate effort needed to arise.
"I'm going to carry you," said Calhoun firmly. "You tell me the way."
He picked her up bodily and marched on. She was light. She was not a large girl, but she should have weighed more. Calhoun still carried the quaint antique weapon without difficulty.
Murgatroyd followed as Calhoun went up a small incline on the greater hillside and down a very narrow ravine. Through brushwood he pushed until he came to a small open space where shelters had been made for a dozen or so human beings. They were utterly primitive—merely roofs of leafy branches over framework of sticks. But of course they were not intended for permanent use. They were meant only to protect plague-stricken folk while they waited to die.
But there was disaster here. Calhoun saw it before the girl could. There were beds of leaves underneath the shelters. There were three bodies lying upon them. They would be those refugees in the terminal coma which, since the girl had described it, accounted for the dead man Calhoun had found, dead of starvation with food plants all around him. But now Calhoun saw something more. He swung the girl swiftly in his arms so that she would not see. He put her gently down and said, "Stay still. Don't move. Don't turn."
He went to make sure. A moment later he raged. It was Calhoun's profession to combat death and illness in all its forms, and he took his profession seriously. There are defeats, of course, which a medical man has to accept, though unwillingly. But nobody in the profession, and least of all a Med Ship man, could fail to be roused to fury by the sight of people who should have been his patients, lying utterly still with their throats cut.
He covered them with branches. He went back to Helen.
"This place has been found by somebody from the city," he told her harshly. "The men in coma have been murdered. I advise you not to look. At a guess, whoever did it is now trying to track down the rest of you."
He went grimly over the small open glade, searching the ground for footprints. There was ground-cover at most places, but at the edge of the clearing he found one set of heavy footprints leading away. He put his own foot beside a print and rested his weight on it. His foot made a lesser depression. The other print had been made by a man weighing more than Calhoun. Therefore it was not one of the party of plague victims.
He found another set of such footprints, entering the glade from another spot.
"One man only," he said icily. "He won't think he has to be on guard, because a city's administrative personnel—such as was left behind for the plague to hit—doesn't usually have weapons among their possessions. And he's confident that all of you are weak enough not to be dangerous to him."
Helen did not turn pale. She was pale before. She stared numbly at Calhoun. He looked grimly at the sky.
"It'll be sunset within the hour," he said savagely. "If it's the intention of the newcomers—the invaders—to burn the bodies of all plague victims, he'll come back here to dispose of these three. He didn't do it before lest the smoke warn the rest of you. But he knows the shelters held more than three people. He'll be back!"
Murgatroyd said "Chee!" in a bewildered fashion. He was on all fours, and he regarded his paws as if they did not belong to him. He panted.
Calhoun checked him over. Respiration way up. Heart action like that of the girl Helen. His temperature was not up, but down. Calhoun said remorsefully, "You and I, Murgatroyd, have a bad time of it in our profession. But mine is the worse. You don't have to play dirty tricks on me, and I've had to, on you!"
Murgatroyd said "Chee!" and whimpered. Calhoun laid him gently on a bed of leaves which was not occupied by a murdered man.
"Lie still!" he commanded. "Exercise is bad for you."
He walked away. Murgatroyd whined faintly, but lay still as if exhausted.
"I'm going to move you," Calhoun told the girl, "so you won't be seen if that man from the city comes back. And I've got to keep out of sight for a while or your friends will mistake me for him. I count on you to vouch for me later. Basically, I'm making an ambush." Then he explained irritably, "I daren't try to trail him because he might not backtrack to return here."
He lifted the girl and placed her where she could see the glade in its entirety, but would not be visible. He settled down himself a little distance away. He was acutely dissatisfied with the measures he was forced to take. He could not follow the murderer and leave Helen and Murgatroyd unprotected, even though the murderer might find another victim because he was not being trailed. In any case Murgatroyd's life, just now, was more important than the life of any human being on Maris III. On him depended everything.
But Calhoun was not pleased with himself at all.
There was silence except for the normal noises of living wild things. There were fluting sounds, which later Calhoun would be told came from crawling creatures not too much unlike the land turtles of Earth. There were deep-bass hummings, which came from the throats of miniature creatures which might roughly be described as birds. There were chirpings which were the cries of what might be approximately described as wild pigs, except that they weren't. But the sun Maris sank low toward the nearer hillcrests, and behind them, and there came a strange, expectant hush over all the landscape. At sundown on Maris III there is a singular period when the creatures of the day are silent and those of the night are not yet active. Nothing moved. Nothing stirred. Even the improbable foliage was still.
It was into this stillness and this half-light that small and intermittent rustling sounds entered. Presently there was a faint murmur of speech. A tall, gaunt young man came out of the brushwood, supporting a pathetically feeble old man, barely able to walk. Calhoun made a gesture of warning as the girl Helen opened her lips to speak. The slowly moving pair came into the glade, the young man moving exhaustedly, the old man staggering with weakness despite his help. The younger helped the older to sit down. He stood panting.
A woman and a man came together, assisting each other. There was barely light enough from the sun's afterglow to show their faces, emaciated and white.
A fifth feeble figure came tottering out of another opening in the brush. He was dark-bearded and broad, and he had been a powerful man. But now the plague lay heavily upon him.
They greeted each other listlessly. They had not yet discovered those of their number who had been murdered.
The gaunt young man summoned his strength and moved toward the shelter where Calhoun had covered an unseemly sight with branches.
Murgatroyd whimpered.
There came another rustling sound, but this had nothing of feebleness in it. Branches were pushed forthrightly out of the way and a man came striding confidently into the small open space. He was well-fleshed, and his color was excellent. Calhoun automatically judged him to be in superlative good health, slightly overweight, and of that physical type which suffers very few psychosomatic troubles because it lives strictly and enjoyably in the present.
Calhoun stood up. He stepped out into the fading light just as the sturdy stranger grinned at the group of plague-stricken semi-skeletons.
"Back, eh?" he said amiably. "Saved me a lot of trouble. I'll make one job of it."
With leisurely confidence he reached to the blaster at his hip.
"Drop it!" snapped Calhoun from behind him. "Drop it!"
The sturdy man whirled. He saw Calhoun with a crossbow raised to cover him. There was light enough to show that it was not a blast-rifle—in fact, that it was no weapon of any kind modern men would ordinarily use. But much more significant to the sturdy man was the fact that Calhoun wore a uniform and was in good health.
He snatched out his blast-pistol with professional alertness.
And Calhoun shot him with the crossbow. It happened that he shot him dead.