"Wait a minute," Brett called. "Didn"t you see the Gel? The one that cornered me back there?"

The fat man looked back suspiciously, kept going.

"Wait!" Brett caught his arm. "I know you"re real. I"ve seen you belch and sweat and pick your nose and scratch. You"re the only one I can call on-and I need help. My friend is trapped-"

The fat man pulled away, his face flushed an even deeper red. "I"m warning you," he snarled. "You maniac! Get away from me . . . !"

Brett stepped close, rammed the fat man hard in the ribs. He sank to his knees, gasping. The panama hat rolled away. Brett grabbed his arm, steadied him.

"Sorry," he said. "I had to be sure. You"re real, all right. We"ve got to rescue my friend, Dhuva-"

The fat man leaned against the gla.s.s, rolling terrified eyes, rubbing his stomach. "I"ll call the police!" he gasped.

"What police?" Brett waved an arm. "Look. Not a car in sight. Did you ever see the street that empty before?"

"Wednesday afternoon," the fat man gasped.

"Come with me. I want to show you. It"s all hollow. There"s nothing behind these walls-"

"Why doesn"t somebody come along?" the fat man moaned, as if to himself.

"The masonry is only a quarter-inch thick," Brett said. "Come on; I"ll show you."

"I don"t like it," said the fat man. His face was pale and moist. "You"re mad. What"s wrong? It"s so quiet . . ."

"We"ve got to try to save him. The Gel took him down into this pit-"

"Let me go," the man whined. "I"m afraid. Can"t you just let me lead my life in peace?"

"Don"t you understand?" Brett lowered his voice with an effort. "The Gel took a man. They may be after you next."

"There"s no one after me! I"m a businessman . . . a respectable citizen. I mind my own business, give to charity, go to church. I never kick dogs or molest elderly ladies. All I want is to be left alone!"

Brett dropped his hands from the fat man"s arms, stood looking at him: the blotched face, pale now, the damp forehead, the quivering jowls. The fat man stooped for his hat, slapped it against his leg, clamped it on his head.

"I think I understand now," said Brett. "This is your place, this imitation city. Everything"s faked to fit your needs-like in the hotel. Wherever you go, the scene unrolls in front of you. You never see the Gels, never discover the secret of the golems-because you conform. You never do the unexpected."

"That"s right," the man gobbled. "I"m law-abiding. I"m respectable. I don"t pry. I don"t nose into other people"s business. Why should I? Just let me alone . . ."

"Sure," Brett said. "Even if I dragged you down there and showed you, you wouldn"t believe it. But you"re not in the scene now. I"ve taken you out of it-"

Suddenly the fat man turned and ran a few yards, then looked back to see whether Brett was pursuing him. He shook a round fist.

"I"ve seen your kind before," he shouted. "Troublemakers."

Brett took a step toward him. The fat man yelped and ran another fifty feet, his coattails bobbing. He looked back, stopped, a fat figure alone in the empty, sunny street.

"You haven"t seen the last of me!" he shouted. "We know how to deal with your kind." He tugged at his vest, went off along the sidewalk. Brett watched him go, then started back toward the hollow building.

The jagged fragments of masonry Brett had knocked from the wall lay as he had left them. He stepped through the opening, peered down into the murky pit, trying to judge its depth. A hundred feet at least. Perhaps a hundred and fifty.

He unslung the rope from his shoulder, tied one end to the bra.s.s stump, threw the coil down the precipitous side. It fell away into darkness, hung swaying. It was impossible to tell whether the end reached any solid footing below. He couldn"t waste any more time looking for help. He would have to try it alone.

There was a slap of shoe leather on the pavement outside. He turned, stepped out into the white sunlight. The fat man rounded the corner, recoiled as he saw Brett. He flung out a pudgy forefinger, his protruding eyes wide in his blotchy red face.

"There he is! I told you he came this way!" Two uniformed policemen came into view. One eyed the gun at Brett"s side, put a hand on his own.

"Better take that off, sir."

"Look!" Brett said to the fat man. He stooped, picked up a crust of masonry. "Look at this-just a sh.e.l.l-"

"He"s blasted a hole right in that building, officer!" the fat man shrilled. "He"s dangerous . . ."

The cop ignored the gaping hole in the wall. "You"ll have to come along with me, sir," it said in a bland, unemphatic voice. "This gentleman registered a complaint . . ."

Brett stood staring into the cop"s eyes. They were pale blue, looking steadily back at him from the expressionless face. Could the cop be real? Or would he be able to push him over, as he had other golems?

"The fellow"s not right in the head," the fat man was saying to the cop. "You should have heard his crazy talk. A troublemaker. His kind have got to be locked up!"

The cop nodded. "Can"t have anyone causing trouble."

"Only a young fellow," said the fat man. He mopped at his forehead with a large handkerchief. "Tragic. But you men know how to handle him."

"Better give me the gun, sir." The cop held out a hand. Brett moved suddenly, rammed stiff fingers into the cop"s ribs. It stiffened, toppled, lay rigid, staring up at nothing.

"You . . . you killed him," the fat man gasped, backing away. The second cop tugged at his gun. Brett leaped at him, sent him down with a blow to the ribs. He turned to face the fat man.

"I didn"t kill them! I just turned them off. They"re not real, they"re just golems."

"A killer! And right in the city, in broad daylight."

"You"ve got to help me!" Brett cried. "This whole scene: don"t you see? It has the air of something improvised in a hurry, to deal with the unexpected factor; that"s me. The Gels know something"s wrong, but they can"t quite figure out what. When you called the cops the Gels obliged-"

Startlingly the fat man burst into tears. He fell to his knees.

"Don"t kill me . . . oh, don"t kill me . . ."

"n.o.body"s going to kill you, you fool!" Brett snapped. "Look! I want to show you!" He seized the fat man"s lapel, dragged him to his feet and across the sidewalk, through the opening. The fat man stopped dead, stumbled back- "What"s this?" he wailed. "What kind of place is this?" He scrambled for the opening.

"It"s what I"ve been trying to tell you. This city you live in-it"s a hollow sh.e.l.l. There"s nothing inside. None of it"s real. Only you . . . and me. There was another man: Dhuva. I was in a cafe with him. A Gel came. He tried to run. It caught him. Now he"s . . . down there."

"I"m not alone," the fat man babbled. "I have my friends, my clubs, my business a.s.sociates. I"m insured. Lately I"ve been thinking a lot about Jesus-"

He broke off, whirled, and jumped for the doorway. Brett leaped after him, caught his coat. It ripped. The fat man stumbled over one of the cop-golems, went to hands and knees. Brett stood over him.

"Get up, d.a.m.n it!" he snapped. "I need help and you"re going to help me!" He hauled the fat man to his feet. "All you have to do is stand by the rope. Dhuva may be unconscious when I find him. You"ll have to help me haul him up. If anybody comes along, any Gels, I mean-give me a signal. A whistle . . . like this-" Brett demonstrated. "And if I get in trouble, do what you can. Here . . ." Brett started to offer the fat man the gun, then handed him the hunting knife. "If anybody interferes, this may not do any good, but it"s something. I"m going down now."

The fat man watched as Brett gripped the rope, let himself over the edge. Brett looked up at the glistening face, the damp strands of hair across the freckled scalp. Brett had no a.s.surance that the man would stay at his post, but he had done what he could.

"Remember," said Brett. "It"s a real man they"ve got, like you and me . . . not a golem. We owe it to him." The fat man"s hands trembled. He watched Brett, licked his lips. Brett started down.

The descent was easy. The rough face of the excavation gave footholds. The end of a decaying timber projected; below it was the stump of a crumbling concrete pipe two feet in diameter. Brett was ten feet below the rim of the floor now. Above, the broad figure of the fat man was visible in silhouette against the jagged opening in the wall.

Now the cliff shelved back; the rope hung free. Brett eased past the cut end of a rusted water pipe, went down hand over hand. If there were nothing at the bottom to give him footing, it would be a long climb back. . . .

Twenty feet below he could see the still, black water, pockmarked with expanding rings where bits of debris dislodged by his pa.s.sage peppered the surface.

There was a rhythmic vibration in the rope. Brett felt it through his hands, a fine sawing sensation. . . .

He was falling, gripping the limp rope. . . .

He slammed on his back in three inches of oily water. The coils of rope collapsed around him with a sustained splashing. He got to his feet, groped for the end of the rope. The glossy nylon strands had been cleanly cut.

For half an hour Brett waded in waist-deep water along a wall of damp clay that rose sheer above him. Far above, bars of dim sunlight crossed the upper reaches of the cavern. He had seen no sign of Dhuva . . . or the Gels.

He encountered a sodden timber that projected above the surface of the pool, clung to it to rest. Bits of flotsam: a plastic toy pistol, bridge tallies, a golf bag, floated in the black water. A tunnel extended through the clay wall ahead; beyond Brett could see a second great cavern rising. He pictured the city, silent and empty above, and the honeycombed earth beneath. He moved on.

An hour later Brett had traversed the second cavern. Now he clung to an outthrust spur of granite, as nearly as he could estimate directly beneath the point at which Dhuva had disappeared. Far above he could see the green-clad waitress standing stiffly on her ledge. He was tired. Walking in water, his feet floundering in soft mud, was exhausting. He was no closer to escape, or to finding Dhuva, than he had been when the fat man cut the rope. He had been a fool to leave the man alone, with a knife . . . but he had had no choice.

He would have to find another way out. Aimlessly wading at the bottom of the pit was useless. He would have to climb. One spot was as good as another. He stepped back and scanned the wall of clay looming over him. Twenty feet up, water dripped from the broken end of a four-inch water main. Brett uncoiled the rope from his shoulder, tied a loop in the end, whirled it and cast upward. It missed, fell back with a splash. He gathered it in, tried again. On the third try it caught. He tested it, then started up. His hands were slippery with mud and water. He twined the rope around his legs, inched higher. The slender cable was smooth as gla.s.s. He slipped back two feet, burning his hands, then inched upward, slipped again, painfully climbed, slipped, climbed.

After the first ten feet he found toeholds in the muddy wall. He worked his way up, his hands aching and raw. A projecting tangle of power cable gave a secure purchase for a foot. He rested. Nearby, an opening two feet in diameter gaped in the clay: a tunnel. It might be possible to swing sideways across the face of the clay and reach the opening. It was worth a try. His stiff, clay-slimed hands would pull him no higher.

He gripped the rope, kicked off sideways, hooked a foot in the tunnel mouth, half jumped, half fell into the mouth of the tunnel. He clung to the rope, shook it loose from the pipe above, coiled it and looped it over his shoulder. On hands and knees he started into the narrow pa.s.sage.

The tunnel curved left, then right, dipped, then angled up. Brett crawled steadily, the smooth, stiff clay yielding and cold against his hands and sodden knees. Another smaller tunnel joined from the left. Another angled in from above. The tunnel widened to three feet, then four. Brett got to his feet, walked in a crouch. Here and there, barely visible in the near darkness, objects lay imbedded in the mud: a silver-plated spoon, its handle bent; the rusted engine of a toy electric train; a portable radio, green with corrosion from burst batteries.

At a distance, Brett estimated, of a hundred yards from the pit, the tunnel opened into a vast cave, green-lit from tiny discs of frosted gla.s.s set in the ceiling far above. A row of discolored concrete piles, the foundation of the building above, protruded against the near wall, their surfaces nibbled and pitted. Between Brett and the concrete columns the floor was littered with pale sticks and stones, gleaming dully in the gloom.

Brett started across the floor. One of the sticks snapped underfoot. He kicked a melon-sized stone. It rolled lightly, came to rest with hollow eyes staring toward him. A human skull.

The floor of the cave covered an area the size of a city block. It was blanketed with human bones, with here and there a small cat skeleton or the fanged snout bones of a dog. There was a constant rushing of rats that played among the rib cages, sat atop crania, scuttled behind shin-bones. Brett picked his way, stepping over imitation pearl necklaces, zircon rings, plastic b.u.t.tons, hearing aids, lipsticks, compacts, corset stays, prosthetic devices, rubber heels, wrist.w.a.tches, lapel watches, pocket watches with corroded bra.s.s chains, all stopped at the same hour: 12:30.

Ahead Brett saw a patch of color: a blur of pale yellow. He hurried, stumbling over bone heaps, crunching eyegla.s.ses underfoot. He reached the still figure where it lay slackly, face down, in its yellow shirt. Gingerly he squatted, turned it on its back. It was Dhuva.

Brett slapped the cold wrists, rubbed the clammy hands. Dhuva stirred, moaned weakly. Brett pulled him to a sitting position. "Wake up!" he whispered. "Wake up!"

Dhuva"s eyelids fluttered. He blinked dully at Brett.

"The Gels may turn up any minute," Brett hissed. "We have to get away from here. Can you walk?"

"I saw it," said Dhuva faintly. "But it moved so fast . . ."

"You"re safe here for the moment," Brett said. "There are none of them around. But they may be back. We"ve got to find a way out!"

Dhuva started up, staring around. "Where am I?" he said hoa.r.s.ely. Brett seized his arm, steadied him on his feet.

"We"re in a hollowed-out cave, under the streets," he said. "The whole city is undermined with them. They"re connected by tunnels. We have to find one leading back to the surface."

Dhuva gazed around at the acres of bones. "It left me here for dead."

"Or to die," said Brett.

"Look at them," Dhuva breathed. "Hundreds . . . thousands . . ."

"The whole population, it looks like. The Gels must have whisked them down here one by one."

"But why?"

"For interfering with the scenes. But that doesn"t matter now. What matters is getting out; Come on. I see tunnels on the other side."

They crossed the broad floor, around them the white bones, the rustle of rats. They reached the far side of the cave, picked a six-foot tunnel which trended upward, a trickle of water seeping out of the dark mouth. They started up the slope.

"We have to have a weapon against the Gels," said Brett.

"Why? I don"t want to fight them." Dhuva"s voice was thin, frightened. "I want to get away from here . . . even back to Wavly. I"d rather face the Duke"s men. At least they"re men."

"This was a real town, once," said Brett. "The Gels have taken it over, hollowed out the buildings, mined the earth under it, killed off the people, and put imitation people in their place. And n.o.body ever knew. I met a man who"s lived here all his life. He doesn"t know. But we know . . . and we have to do something about it."

"It"s not our business. I"ve had enough. I want to get away."

"The Gels must stay down below, somewhere in that maze of tunnels. For some reason they try to keep up appearances . . . but only for the people who belong here. They play out scenes for the fat man, wherever he goes. And he never goes anywhere he isn"t expected to."

"We"ll get over the wall somehow," said Dhuva. "We may starve, crossing the dry fields, but that"s better than this."

They emerged from the tunnel into a coal bin, crossed to a sagging door, found themselves in a boiler room. Stairs led up to sunlight. In the street, in the shadow of tall buildings, a boxy Buick sedan was parked at the curb. Brett went to it, tried the door. It opened. Keys dangled from the ignition switch. He slid into the dusty seat. Behind him there was a hoa.r.s.e scream. Brett looked up. Through the streaked windshield he saw a mighty Gel rear up before Dhuva, crouched back against the blackened brick front of the building.

"Don"t move, Dhuva!" Brett shouted. Dhuva froze, flattened against the wall. The Gel towered, its surface rippling, uncertain.

Brett eased from the seat, behind the Gel. He stood on the pavement, fifteen feet from the Gel. The rank Gel odor came in waves from the creature. Beyond it Brett could see Dhuva"s white, terrified face. Brett"s mind raced, searching for an idea. On impulse he went to the front of the car.

Silently, he turned and lifted the latch of the old-fashioned side-opening auto hood, raised it. The copper fuel line curved down from the firewall to a gla.s.s sediment cup. The knurled retaining screw turned easily; the cup dropped into Brett"s hand. Gasoline ran down in an amber stream. He pulled off his damp coat, wadded it, jammed it under the flow. Over his shoulder he saw Dhuva, still rigid, and the hovering, puzzled giant.

The coat was saturated with gasoline now. Brett shook it out, fumbled a matchbox from his pocket-then threw the sodden container aside. The battery caught his eye, clamped in a rusted frame under the hood. He jerked the pistol from its holster, used it to short the terminals. Tiny blue sparks jumped. He jammed the coat near, rasped the gun against the soft lead poles. With a whoosh! the coat caught, yellow flames leaped, soot-rimmed. Brett s.n.a.t.c.hed it by a sleeve, whirled, flung the blazing garment over the great Gel as it sped toward him.

The creature went mad. It slumped, lashed itself against the pavement. The burning coat was thrown clear. The Gel threw itself across the pavement, into the gutter, sending a splatter of filthy water over Brett. From the corner of his eye, Brett saw Dhuva totter, then seize the burning coat, hurl it into the pooled gasoline in the gutter. Fire leaped up twenty feet high; in its center the great Gel bucked and writhed. The ancient car shuddered as the frantic monster struck it. Black smoke boiled up; an unbelievable stench came to Brett"s nostrils. He backed, coughing. Flames roared around the front of the car. Paint blistered and burned. A tire burst. In a final frenzy the Gel whipped clear, lay, a great blackened shape of melting rubber, twitching, then still. His eyes met Dhuva"s.

"Good thinking, Brett," the latter said. "How did you know?" he queried.