Brother Assassin

  Brother Assassin

  Fred Saberhagen

  PART ONE

  LIEUTENANT DERRON ODEGARD leaned back in his contour chair for just long enough to wipe his somewhat sweaty palms on the legs of his easy-fitting duty uniform, and to shift minutely the position of the padded headset on his skull. He performed these nervous actions without taking his eyes from the tangled green pattern on the wide, slightly curved viewscreen before him; then he leaned forward again and resumed his hunt for the enemy.

  After only half an hour on watch he was already bone-tired, feeling the weight of every one of his planet’s forty million surviving inhabitants resting crushingly on the back of his neck. He didn’t want to bear the burden of responsibility for any of those lives, but at the moment there was nowhere to set it down. Being an officer and a sentry gained a man a bit of material comfort and allowed him a bit less regimentation when he went off duty—but let a sentry make one gross mistake on the job, and the entire surviving population of the planet Sirgol could be tumbled into nothingness, knocked out of real-time and killed, ended so completely that they would never have existed at all.

  Derron’s hands rested easily and lightly on the molded controls of his console; there was a good deal of skill, though nothing like love, in his touch. Before him on the screen, the green, tangled cathode traces shifted at his will, like tall grasses pushed aside by the hands of a cautious hunter. This symbolic grass through which he searched represented the interwoven lifelines of all the animals and plants that nourished, or had flourished, upon a certain few square miles of Sirgol’s land surface, during a few decades of time, some twenty thousand years deep in the prehistoric past.

  Surrounding Derron Odegard’s chair and console were those of other sentries, a thousand units all aligned in long, subtly curving rows. Their arrangement pleased and rested the momentarily lifted eye, then led the gaze back to the viewscreen where it belonged. Concentration was further encouraged by the gentle modulations that sometimes passed like drifting clouds across the artificial light, which flowed from the strongly vaulted ceiling of this buried chamber, and by the insistent psych-music that came murmuring in and out of headsets, airy melodies now and then supported on an elemental, heavy beat. In this chamber buried below many miles of rock, the air was fresh with drifting breezes, scented convincingly with the tang of the sea or the smell of green fields, with various reminiscences of the living soil and water that the berserkers’ bombardment had wiped away, months ago, from Sirgol’s surface.

  Again, the traces representing interconnected life rippled on Derron’s viewscreen as he touched the controls. In the remote past, the infraelectronic spy devices connected to his screen were moving at his command. They did not stir the branches nor startle the fauna in the ancient forests they surveyed. Instead they hovered just outside reality, not interfering, avoiding most of the nets of paradox spread by reality for man or machine that traveled in time. The spy devices lurked just around the local curves of probability from real-time, able to sense even from that position the lines of powerful organization of matter that were life.

  Derron knew that his assigned sector, nearly twenty thousand years back, was somewhere near the time of the First Men’s coming to Sirgol, but he had not yet seen the trace, unmistakably powerful, of a human lifeline there. He was not looking for humans especially. What mattered was that neither he nor any other sentry had yet observed the splash of disruptive change that would mean a berserker attack; the gigantic machines besieging the planet in present-time had perhaps not yet discovered that it was possible here to invade the past.

  Like a good sentry in any army, Derron avoided letting his own moves become predictable as he walked his post. From his seat in remote physical comfort and relative physical safety, he monitored the signals of one spy device after another, ranging now a decade farther into the past, then five miles north; next two years uptime, then a dozen miles southwest. Still no alien predator’s passage showed in the lush symbolic grass that grew on Derron’s screen. The enemy he sought had no lifeline of its own, and would be visible only by the death and disruption that it broadcast.

  “Nothing yet,” said Derron curtly, without turning, when he felt his supervisor’s presence at his elbow.

  The supervisor, a captain, remained looking on for a moment and then without comment walked quietly on down the narrow aisle. Still without lifting his eyes from his screen, Derron frowned. It irritated him to realize that he had forgotten the captain’s name. Well, this was only the captain’s second day on the job, and the captain, or Derron, or both of them, might be transferred to some other duty tomorrow. The Time Operations Section of Sirgol’s Planetary Defense Forces was organizationally fluid, to put it mildly. Only a few months ago had the defenders realized that the siege might be extended into time warfare. This sentry room, and the rest of Time Operations, had been really functional for only about a month, and it had yet to handle a real fight. Luckily, the techniques of time warfare were almost certainly entirely new to the enemy also; nowhere else but around the planet Sirgol was time travel known to be possible.

  Before Derron Odegard had managed to recall his captain’s name, the first battle fought by Time Operations had begun. For Derron it began very simply and undramatically, with the calm feminine voice of one of the communicators flowing into his earphones to announce that the berserker space fleet had launched toward the planet several devices that did not behave like ordinary missiles. As these weapons fell toward the planet’s surface they vanished from direct observation; the sentry screens soon discovered them in probability-space, falling into the planet’s past.

  There were five or six objects—the number was soon confirmed as six—dropping eight thousand years down, ten thousand, twelve. The sentries watching over the affected sectors were alerted one after another. But the enemy seemed to understand that his passage was being closely followed. Only when the six devices had passed the twenty-one-thousand-year level, when their depth in the abyss of time had made observation from the present practically impossible, did they stop. Somewhere.

  “Attention, all sentries,” said a familiar, drawling male voice in Derron’s headset. “This is the Time Operations commander, to let you all know as much as I do about what’s going on. Looks like they’re setting up a staging area for themselves down there, about minus twenty-one thousand. They can shoot stuff uptime at us from there, and we probably won’t be able to spot it until it breaks into real-time on us, and maybe not until it starts killing.”

  The psych-music came back. A few minutes passed before the calm voice of a communications girl spoke to Derron individually, relaying orders for him to shift his pattern of search, telling him in which dimensions and by how much to change his sector. The sentries would be shifting all along the line, which meant that an enemy penetration into real-time was suspected. Observers would be concentrating near the area of the invasion while still maintaining a certain amount of coverage everywhere else. The first enemy attack might be only a diversion.

  These days, when an enemy missile dug near the shelters, Derron rarely bothered to take cover, never felt anything worse than the remotest and vaguest sort of fear; it was the same for him now, knowing that battle was joined, or about to be. His eye and hand remained as steady as if he knew this was only one more routine training exercise. There were advantages in not caring very much whether death came now or later.

  Still, he could not escape the hateful weight of responsibility, and the minutes of the watch dragged more slowly now than ever. Twice more the imperturbable female voice changed Derron’s search sector. Then the Time Ops commander came back on to confirm officially that an attack was launched.

  “Now keep your eyes open, boys,�
� said the drawling voice to all the sentries, “and find me that keyhole.”

  At some time deeper than twenty thousand years in the past, at some place as yet undetermined, the keyhole must exist—an opening from probability-space into real-time, created by the invasion of the six berserker devices.

  Had men’s eyes been able to watch their arrival directly, they would have seen the killing machines, looking like six stub-winged aircraft, materialize apparently from nowhere in a spot high in Sirgol’s atmosphere. Like precision fliers, the machines exploded at once out of the compact formation in which they had appeared to scatter in six separate directions at multisonic speed.

  And, as they separated, the six immediately began seeding the helpless world below them with poison. Radioactives, antibiotic chemicals … it was hard to tell from a distance of twenty thousand years just what they were using. Like the other sentries, Derron Odegard saw the attack only by its effects. He perceived it as a diminution in the probability of existence of all the life in his sector, a rising tide of moribundity beginning in one corner of that sector and washing slowly over the rest.

  The six machines were poisoning the whole planet. If the First Men were on the surface at the time of this attack, it would of course kill them; if they landed later they would wander baby-helpless to their deaths in a foodless, sterile world. And, if that happened, the descendants in present-time of the First Men, the entire surviving population, would cease to exist. The planet and the system would be the berserkers’ for the taking.

  The rising odds on world death spread up through prehistory and history. In each living cell on the planet the dark tide of nonexistence rose, a malignant change visible on every sentry screen.

  The many observed vectors of that change were plotted by men and computers working together in Time Operations’ nerve center. They had a wealth of data to work with; perhaps no more than twenty minutes of present-time had passed from the start of the attack until the computers announced that the keyhole of the six enemy flying machines had been pinpointed.

  In the deeper catacomb called Operations Stage Two, the defensive missiles waited in stacks, their blunt simple shapes surrounded by complexities of control and launching mechanism. At the command of Operations’ computers and their human overseers, steel arms extended a missile sideways from its rack, while on the dark stone floor beneath it there appeared a silvery circle, shimmering like a pool of troubled liquid.

  The arms released the missile, and in the first instant of falling it disappeared. While one set of forces propelled it into the past, another sent it as a probability-wave up through the miles of rock, to the surface of the planet and beyond, into the stratosphere, straight for the keyhole through which the six devices of the enemy had entered real-time.

  Derron saw the ominous changes that had been creeping across his screen begin suddenly to reverse themselves. It looked like a trick, like a film run backward, like some stunt without relevance to the real world.

  “Right in the keyhole!” yelped the Time Ops commander’s voice, drawling no longer. The six berserker devices now shared their point of entry into real-time with an atomic explosion, neatly tailored to fit.

  As every screen showed the waves of death receding, jubilation spread in murmurous waves of its own, up and down the long curved ranks of sentry posts. But caution and discipline combined to keep the rejoicing muted. The remainder of the six-hour shift passed in the manner of a training exercise, in which all the i’s were properly dotted and the f s crossed, the tactical success made certain by observations and tests. But beneath the discipline and caution the jubilation quietly persisted. Men who were relieved on schedule for their breaks passed one another smiling and winking. Derron smiled like everyone else when someone met his eye. To go along, to show the expected reaction, was socially the easiest course. And he did feel a certain pride in having done a good job.

  When the shift ended without any further sign of enemy action, it was certain that the berserkers’ first venture into time warfare had been beaten back into nonexistence.

  But the damned machines would come back, as they always did, thought Derron. Stiff and sweaty and mentally tired, not bothering to smile this time, he rose from his chair with a sigh of relief to make room for the sentry on the next shift.

  “I guess you people did all right today,” said the replacement, a touch of envy in his voice.

  Derron managed one more smile. “You can have the next chance for glory.” He pressed his thumbprint into the appropriate place on the console’s scanner, as the other man did the same. Then, officially relieved, he walked at a dragging pace out of the sentry room, joining the stream of other members of his shift. Here and there another face appeared as grim and tired as he knew his own must look. But once they had passed through the doors that marked the area of enforced quiet, most of the men formed excited groups and started to whoop it up a little.

  Derron stood in line to turn in his recording cartridge with its record of his shift activity. Then he stood in another line, to make a short oral report to one of the debriefing officers. And after that he was free. As if, he thought, freedom had any meaning these days for a citizen of Sirgol.

  A huge passenger elevator, one of a string that worked like buckets on an endless belt, lifted him amid a crowd of others out of the deeper caves of Operations to the housing level of the buried world-city. At this depth there were still miles of rock overhead.

  The ideal physical environment of the sentry room was not to be found on Housing Level or at any other place where maximum human efficiency was not considered essential at all times. Throughout most of Housing Level the air tended to be stale at best, and at worst it was burdened with unpleasant odors. The lighting along most of the gray street-corridors was no better than it had to be. In most public places decoration was limited to the ubiquitous signs and posters, which, in the name of the government, exhorted the people to greater efforts for victory or promised them that improvements in living conditions were on the way. .Here and there, such improvements were slowly being made. From month to month, the air became a little fresher, the food a little more varied and tastier. Given the practically limitless power of hydrogen fusion to labor for them upon the mineral wealth of the surrounding rock, it seemed that the besieged planet garrison might sustain itself indefinitely, in gradually increasing comfort.

  The corridor in which Derron now walked was one of the main thoroughfares of the buried world-city. His bachelor officer’s cubicle was one of the housing units that, along with shops and offices, lined its sides. The corridor was two stories high and as wide as an ordinary main street in some ordinary minor city of the late lamented surface world. Down its center were laid moving belts, ridden in either direction by people who had to go farther than they could conveniently walk. Derron could see pairs of white-uniformed police rushing past on the belts now, checking the dog tags of travelers. Planetary Command was evidently cracking down on work evaders.

  As usual, the broad statwalks on either side of the moving strips were moderately crowded with an assortment of people. Men and women in work uniforms monotonously alike were going to their jobs or leaving them, at a pace neither hurried nor slow. Only a group of children just set free from some schoolroom were displaying any excess of energy. A very few adults and young people, off duty, strolled the walks or stood in line before the stores and places of amusement. Those businesses still under some semblance of private management seemed on the average to do a brisker trade than those wholly operated by the government.

  One of the shorter queues of customers was the one before the local branch of the Homestead Office. Like the other small offices and shops, it was an area partitioned off by wire and glass to one side of the wide corridor. Standing in front of the Homestead Office on the statwalk, Derron looked in at the lethargic clerks, at the display of curling posters and somehow shabby models. The displays depicted, in colors meant to glow impressively, a number of plans for the postw
ar rehabilitation of the planet’s surface.

  APPLY NOW FOR THE LAND YOU WANT!

  Of land there was no shortage. Substances breathable and drinkable, however, might be hard to find. But the Homestead assumption was that someday—after victory, of course—there would be a good new life for all on the surface, a life nourished and protected by the new oceans of air and water that were to be somehow squeezed from the planet’s deep rock or, if need be, brought in from the giant outer planets of the Sirgol system.

  To judge by their uniform insignia, the people standing in the short line before the Homestead office were of all classifications and ranks. But at the moment they were all displaying what an earlier age might have called a peasant patience. With eyes that hoped and wanted to believe, they fed their gaze on the models and the posters. Derron had stopped on the statwalk mainly to look at these people standing in line. All of them had somehow managed to forget, if indeed they had ever allowed themselves to grasp the fact, that the world was dead. The real world, the one that mattered, had been killed and cremated, along with nine out of the ten of the people who had made it live.

  Not that the nine out of ten, the statistics, really mattered to Derron. Or, he thought, to anyone else. It was always only the individual who mattered. …

  A familiar face, a beloved face, came into Derron’s thoughts, and he pushed it wearily away and turned from the believers who were waiting in line for a chance to strengthen their belief.

  He began to walk toward his cubicle once more; but when he came to a place where the corridor branched, he turned on impulse to follow the narrow side passage. It was like an alley, dark and with few doors or windows; but a hundred paces ahead it ended in an arch that framed the living green of real treetops. At this time of day there would not be many people in the park.

  He had not taken many steps down the side corridor before he felt the tremor of an explosion come racing through the living rock surrounding him. Ahead, he saw two small red birds streak in alarm across the green of the trees. He kept on walking without hesitating or breaking stride, and had taken three more paces before the sound came, dull and muffled but heavy. It must have been a small missile penetration, fairly close by. From the besieging fleet in space the enemy threw down probability-waves that sometimes got through the defenses and the miles of shielding rock and then turned into missiles and so into explosions in the vicinity of the buried shelters.