She loved to see the Expedition train strung out across the Lowland's arid plain, with its spindling-drawn wagons, the chains of servants and bearers, the gleaming coach that transported her father and his precious books, even the small flock of runner-birds. If the weather was fine the Philosophers themselves would walk, marching into the Lowland's mysteries, arguing endlessly. The Lowland Expedition was a grand gesture of the civilization of the Shelf that had sp.a.w.ned it and it was brave too, for all the explorers knew that they could never go home again, whatever they discovered.

Down there was Tomm, one of the junior cartographers. Whenever Enna flew Tomm always wore a special red cap so she could pick him out, a bright red dot in the dusty line of Philosophers. At twenty-one he was just a year older than Enna herself and he was her lover, though that was a secret to all but her closest friends, and certainly to her father, or so she hoped. When he saw her, he waved. But his waving was sluggish, like an old man's.

On Old Earth time was layered. When she rode her balloon up into the air, she was ascending into quicker time. If Tomm's ears had been sensitive enough he would have heard her heart fluttering like a bird's, and conversely when she looked down at him he was slowed, trapped in glutinous, redshifted time.

The balloon flights were invaluable aids to navigation, but Bayle, Enna's father, had strictly ordered that flights should be short, and that his party should take it in turn to man them, so that no one fell too far out of synchronization with the rest. "This trip is challenging enough for us all," he insisted, "without the wheels of time slipping too." Enna accepted this wisdom. Even now, despite the joy of the flight, she longed to break through the barriers of streamed time that separated her from her love.

But when she spied the city on the horizon she forgot even Tomm.

The light of the Lowland was strange, shifting. Storms of light swept across its surface, silent and flaring white. These founts of brightness were in fact the major source of light on Old Earth, but they made the seeing uncertain. Enna was unsure at first that the bright white line she spied on the horizon was anything but weather: a low cloud, a dust devil, even a minor light storm.

But in a rare instant of clear seeing, it resolved into a cl.u.s.ter of geometrical shapes, unmistakably artificial. It must be a city, stranded in the middle of the Lowland, where n.o.body had expected to find any signs of humanity but the meanest degradation. And Enna had discovered it.

She turned immediately to the pilot. "Do you see it? There, the city, can you see? Oh, take us down! Take us down!"

The expedition's chief pilot was a bluff, good-humored fellow called Momo. A long-time, military-service companion of her father, he was one of the few people to whom Bayle would entrust his daughter's life. As he had lost one eye in the wars, he "couldn't see a blessed thing," he told her. But he believed her, and began to tug on the ropes that controlled the hot-air balloon's burner.

Enna leaned over the descending gondola, yelling out news of her discovery. As the time differentials melted away, faces turned slowly up towards her.

The Philosophers entered the city in wonder. Enna walked hand in hand with Tomm.

The city was a jumble of cubes and rhomboids, pyramids and tetrahedrons even one handsome dodecahedron. The walls were gleaming white surfaces, smooth to the touch, neither hot nor cold, and pierced by sharp-edged doorways and windows. The buildings towered over the explorers, immense blocks of a geometric perfection that would have shamed even the grand civic centre of New Foro, Enna thought.

There were no doors, though, and the windows weren't glazed. And there were plenty of other peculiarities. Without inner part.i.tions, each building was like "one big room," as Tomm put it. Between the buildings the ground was just dirt, not paved or cobbled as were the streets of New Foro, back on the Shelf.

"And there's n.o.body here," Enna whispered. "Not a soul! It's so strange."

"But wonderful," Tomm said. He was tall, strong but spa.r.s.ely built, with a languid grace that disturbed her dreams. "This must be a terribly ancient place. Look at the finish of these walls what is this stuff, stone, ceramic, gla.s.s? Far beyond anything we are capable of. Perhaps the builders were Weapon-makers."

"Maybe, but don't you think it's all rather eerie? And it's such a jumble "

"A cartographer's nightmare," Tomm laughed.

"And why are there no windows or doors?"

"We can make windows," he said. "We can hang doors." He took her hands. "Questions, questions, Enna! You're worse than all these grumpy old Philosophers. This is your discovery. Relish the moment!"

There was a deep harrumph harrumph. Bayle, Enna's father, came walking towards them, trailed by acolytes, lesser men but Philosophers themselves. "But she's right," Bayle said. "There is familiarity, and yet perhaps that blinds us to how much is strange..."

Tomm hastily released Enna's hands.

Bayle wore his dress uniform, topped off by his cap of spindling fur and feathers. Though he had devoted the last three decades of his life to science, Bayle had retained an honorary rank in the army of New Foro, and "for the sake of general morale," as he put it, he donned his uniform to mark moments of particular significance during their long journey. But Enna knew that no matter how extravagant his appearance, her father's mind was sharper than any around him.

He tapped the walls of the nearest building with his stick. "Certainly the layout follows no obvious rational design, as does the centre of New Foro, say. But there are patterns here." He walked them briskly through the narrow alleys between the buildings. "Can you see how the largest buildings are cl.u.s.tered on the outside, and the smaller huts are trapped in their shade?"

"It almost looks organic," Enna said impulsively. "Like a forest, dominated by its tallest trees."

Bayle eyed her appreciatively. "I was going to compare it to a bank of salt crystals." Salt had become something of an obsession of Bayle's during their journey. There was salt everywhere in the Lowlands; there were even plains covered with the stuff, the relics of dried-up lakes. Bayle was gathering evidence for his contention that the Lowland had once been the bed of a mighty body of water. "But I admit, daughter, that your a.n.a.logy may be more apt. This city is not planned as we think of it. It is almost as if it has was going to compare it to a bank of salt crystals." Salt had become something of an obsession of Bayle's during their journey. There was salt everywhere in the Lowlands; there were even plains covered with the stuff, the relics of dried-up lakes. Bayle was gathering evidence for his contention that the Lowland had once been the bed of a mighty body of water. "But I admit, daughter, that your a.n.a.logy may be more apt. This city is not planned as we think of it. It is almost as if it has grown grown here." here."

Tomm seemed confused. "But that's just an a.n.a.logy. I mean, this is a city, built by human hands though maybe long ago. That much is obvious, isn't it?"

Bayle snapped, "If everything were obvious we would not have needed to come out here to study it." He gave Enna a look that spoke volumes. A pretty face but a shallow mind A pretty face but a shallow mind, said that withering expression; you can do better you can do better.

But Tomm was Enna's choice, and she returned his glare defiantly.

They were interrupted by a raucous hail. "Sir, sir! Look what I've found!" It was Momo. The burly, one-eyed pilot came stumbling around the corner of a building.

And walking with him was a woman. Dressed in some kind of sc.r.a.ped animal skin, she was tall, aged perhaps fifty, in her way elegant despite her ragged costume. She eyed the Philosophers, detached. In that first moment Enna thought she seemed as cold, strange, and hard-edged as her city.

Bayle stepped forward, his gloved hand extended. "Madam," he said, "if you can understand me, we have a great deal to discuss." The woman took her father's hand and shook it. The subordinate Philosophers applauded enthusiastically.

In its way this was another remarkable moment in this trek of discovery. This was Bayle's first contact with any of the "lost souls" believed to inhabit the Lowland, stranded here from ages past; to find such people and "rehabilitate" them had been one of his stated goals from the beginning.

But Enna caught a strange whiff about her, an iron stink that at first she couldn't place. It was only later that she realized it was the smell of raw meat of blood.

As night fell, the explorers and their attendants and servants dispersed gladly into the city's bare buildings. After the dirt of the plain, it was going to be a relief to spend a night within solid walls.

Bayle himself established his base in one of the grander buildings on the edge of the city, bathed in light even at the end of the day. It seemed he planned to spend most of the night in conversation with the woman, as far as anybody could tell the city's sole inhabitant; he said they had much to learn from each other. He kissed his daughter goodnight, trusting her safety to his companions, and to her own common sense.

So it was a betrayal of him, of a sort, when in the darkest night Enna sought out Tomm's warm arms. It wasn't hard for her to put her guilt aside; at twenty she had a healthy awareness of how far her father's opinions should govern her life.

But she dreamed. She dreamed that the building itself gathered her up and lifted her into the sky, just as she was cradled by Tomm's arms. And she thought she smelled an iron tang, the scent of blood. Then the dream became disturbing, a dream of confinement.

Bayle had formulated many objectives for his Expedition.

Always visible from Foro, Puul, and the other towns of the Shelf, the Lowland, stretching away below in redshifted ambiguity, had been a mystery throughout history. Now cartographers would map the Lowland. Historians, anthropologists, and moralists hoped to make contact with the lost people of the Lowland plains, if any survived. Clerics, mystics, doctors, and other Philosophers hoped to learn something about Effigies, those spectral apparitions which rose from dying human bodies and fled to the redshifted mysteries of the Lowland. Perhaps some insight would be gained into the cause of the Formidable Caresses, the tremendous rattlings which regularly shook human civilization to pieces. There were even a few soldiers and armorers, hoping to track down Weapons, ancient technology gone wild, too wily to have been captured so far.

There had already been many successes. Take the light storms, for instance.

On Old Earth, day and night and the seasons of the year were governed by the flickering uncertainties of the light that emanated from the Lowland. Now Bayle's physicists had discovered that these waves of light pulsed at many frequencies, "like the harmonics of a plucked string," as one mathematician described it. Not only that, because of the redshifting of the light that struggled up to higher alt.i.tudes, the harmonic peaks that governed the daily cycles here were different from those to be observed from Foro, up on the Shelf where, because of the stratification of time, the length of the "day" was so much shorter.

Enna had been walked through the logic by her father. The effects of time stratification, redshifting, and light cycling subtly intermeshed so that whether you were up on the Shelf or down in the Lowland the length of day and night you perceived was roughly similar. This surely couldn't be a coincidence. As Bayle said, "It adds up to a remarkable mathematical argument for the whole world's having been designed designed to be habitable by people and their creatures." to be habitable by people and their creatures."

That, of course, had provoked a lively debate.

Forons were traditionally Mechanists, adhering to a strand of natural philosophy that held that there was no governing mind behind the world, that everything about it had emerged from the blind working-out of natural laws like the growth of a salt crystal, say. However, there were hard-line Creationists who argued that everything everything on Old Earth required a purposeful explanation. on Old Earth required a purposeful explanation.

After centuries of debate a certain compromise view had emerged, it seemed to Enna, a melding of extreme viewpoints based on the evidence. Even the most ardent Mechanists had had to accept that the world contained overwhelming evidence that it had been manufactured, or at least heavily engineered. But if Old Earth was a machine, it was a very old machine, and in the ages since its formation, natural processes of the kind argued for by the Mechanists had surely operated to modify the world.

At the heart of Bayle's project was a deep ambition to reconcile the two great poles of human thought, the Mechanist versus the Creationist and to end centuries of theological conflict over which too much blood had been spilled.

In the morning Enna and Tomm were among the first to stir. They emerged from their respective buildings, and greeted each other with a jolly innocence that probably fooled n.o.body.

Cartographer Tomm had been detailed to take up the balloon for a rapid aerial survey, to provide context for the more painstaking work on the ground. Enna, free of specific ch.o.r.es, decided to ride up with him.

But there was a problem. They couldn't find pilot Momo.

Tomm was unconcerned. "So old One-eye treated himself to a party last night."

"That isn't like Momo." He was a habitual early riser, like Bayle himself a relic from military days, it seemed.

"He won't be the only one "

"That isn't like him!" Enna snapped, growing impatient. When Tomm treated her like a foolish child, Enna had some sympathy for her father's view of him. "Look, this is a strange city which we barely explored before splitting up. You can help me find Momo, or use the hot air you're spouting to go blow up the balloon yourself."

He was crestfallen, but she stalked off to search, and Tomm, embarra.s.sed, hurried after her.

She thought she remembered the building Momo had chosen as his shelter. She headed that way now. But something was wrong. As she followed the unpaved alleys, the layout of the buildings didn't quite match her memory of the night before. Of course she had only had a quick glimpse of the city, and the light of morning, playing over these crisp, creamy walls, was quite different. But even so, she wouldn't have expected to get so lost as this.

And when she came to the place where she thought Momo's building should have been, there was only a blank s.p.a.ce. She walked back and forth over the bare ground, disoriented, dread gathering in her soul.

"You must be mistaken," Tomm insisted.

"I'm good at direction-finding, Tomm. You know that."

Playfully he said, "You found your way to my bed well enough "

"Oh, shut up. This is serious. This is where Momo's shelter was, I'm sure of it. Something has changed. I can feel it."

Tomm said defensively, "That doesn't sound very scientific."

"Then help me, cartographer. Did any of you make a map last night?"

"Of course not. The light was poor. We knew there would be time enough today."

She glared at him. But she was being unfair; it was a perfectly reasonable a.s.sumption that a city like this wouldn't change overnight.

But the fact of the matter was, Momo was still missing.

Growing increasingly disturbed, she went to her father's room. That at least was just where it had been last night. But her father wouldn't see her; a busybody junior Philosopher barred her from even entering the door. Bayle was still deep in discussion with Sila, the ragged city woman, and he had left strict instructions to be disturbed by n.o.body not even Enna, who had grown up in her father's shadow.

Tomm, apologetically, said he had to go get on with his work, Momo or no Momo. Distracted, Enna kissed him goodbye, and continued her search.

In the hours that followed, she walked the length and breadth of the city. She didn't find Momo. But she did learn that he wasn't the only missing person; two others had vanished, both servants. Though a few people were troubled, most seemed sure it was just a case of getting lost in a strange city. And as for the uncertain geography, she saw doubt in a few eyes. But the Philosophers, far better educated than she was, had no room in their heads for such strange and confusing notions.

Tomm went sailing over the city in his balloon, a junior pilot at his side, and she dutifully wore the red cap. Time-accelerated, he waved like a jerky puppet. But she didn't find Momo, or dispel her feeling of disquiet.

That evening, to her astonishment, her father let it be known that he was hosting a dinner and Sila, the ragged city woman, was to be guest of honor. Enna couldn't remember her father showing such cra.s.s misjudgment before, and she wondered if he had somehow been seduced by this exotic city of the Lowland, or, worse, by the woman, Sila, of whom Enna still knew nothing at all. But still Bayle's entourage would not let her near him.

She made the best of it. She put on the finest dress in her luggage, and decorated her hair with her best jewelry, including the pretty piece her mother had given her when they bade their tearful goodbyes. But as she brushed her hair by the light of her spindling-fat lamp, the blank walls of the city building seemed to press down over her.

She clambered out to meet Tomm. He was still in his traveling clothes; he had not been invited to the dinner.

"You look wonderful," he said.

She knew he meant it, and her heart softened. "Thanks." She let him kiss her.

"Do you suppose I'm allowed to walk you over?"

"I'd like that. But, Tomm " She glanced back at the building, the gaping unglazed windows like eye sockets. "Put my luggage back in one of our wagons. I don't care which one. I'm not spending another night in one of these boxes."

"Ah. Not even with me?"

"Not even with you. I'm sorry, Tomm."

"Don't be. As long as you let me share your wagon."

She was stunned by the sight that awaited her in her father's building. Three long trestle-tables had been set up and laid with cloths and the best cutlery and china. Candles glowed on the tables, where finely dressed guests had already taken their seats. At the head table sat Bayle himself, with his closest confidantes and his guest of honor, Sila, dressed now in a fine flowing black robe. From a smaller building co-opted as a kitchen, a steamy smell of vegetables emanated, while five fat runner-chicks slowly roasted on spits.

Enna had grown up in a world shaped by her father's organizational skills, of which the Expedition was perhaps the crowning glory. But even she was impressed by the speed and skill with which this event had been a.s.sembled. After all, the party had only reached this mysterious Lowland city a day before.

When he saw Enna, Bayle stood up and waved her forward. Led by Nool, Bayle's sleek manservant, Enna took her place at her father's right hand side. Sila sat on his left.

Enna leaned close to her father. "I've got to talk to you. I've been trying all day."

"I know you have. Priorities, my dear."

That was a word she had heard all her life. But she insisted, "Something isn't right here. People are missing. The geography "

He looked at her, briefly concerned. "I know you're no fool, my dear, and I will hear you out. But not now. We'll make time at the end of the dinner."

She wasn't going to get any more from him. But as her father sat back, she caught the eye of the city woman, Sila. She imagined there was a calculation in Sila's deep gaze as it met her own. She wondered what Sila truly wanted and what it would cost them all if she achieved it.

The food was good, of course; her father would have allowed nothing less, and the wine flowed voluminously, though Enna refused to touch a drop. She longed for the meal to be over, so she could talk to Bayle before another night fell. At last the final dish was cleared away, the gla.s.ses refilled for the final time.

And, to Enna's intense frustration, Bayle got to his feet and began to make a speech.

He had spent the night and much of the day in conversation with Sila, he said, and a remarkable experience it had been.

Everybody had expected to find people, down here on the Lowland. For generations the judges of Foro had used "time pits" as a punishment measure. The logic was simple. The deeper you fell, the slower time pa.s.sed for you. So by being hurled into the time pits you were banished to the future. n.o.body had ever climbed back up. But as time had gone by rumors wafted up to the Shelf that some, at least, of the criminals of the past had survived, down there in their redshifted prison.

"The time pits have long been stopped up," Bayle said now, "and we look back on such methods with shame. We long to discover what has become of our exiled citizens, and their offspring and we long to reach out the hand of rationality and hope to them. Our consciences would permit nothing less.

"And now we have found those lost souls in the person of Sila. She is the daughter of an exile, whose crime was political. Sila grew up almost in isolation with her mother, her only society a drifting transient collection of refugees from many ages. And yet she is educated and articulate, with a sound moral compa.s.s; it would take very little grooming indeed for her to pa.s.s as a citizen of Foro.

"There may be no society as we know it here, no government, no community. But the inhabitants of the Lowland are not animals, but people, as we are. In her person Sila demonstrates the fundamental goodness of human nature, whatever its environment and I for one applaud her for that."

This was greeted by murmured appreciation and bangs of the tables. Sila looked out at the Philosophers, a small smile barely dissipating the coldness of her expression.

Now Bayle came to the emotional climax of his speech. "We all knew when we embarked from Foro that this would not just be an Expedition to the Lowland, but into time. We are all of us lost in the future, and with every day that pa.s.ses here, the further that awful distance from home grows." He glanced at Enna, and she knew he was thinking of her mother, his wife, who had been too ill to travel with them on this journey and who, as a consequence, Enna would never see again. "All of you made a sacrifice for knowledge, a sacrifice without precedent in the history of our civilization.