Kin grabbed the lamp. Azrifel appeared, standing on air, and watching the silent fighters with interest.

'Separate them,' Kin ordered.

'No.'

Marco somersaulted away from Silver, caught her arm in three of his, and threw her over his shoulder. His leg bones bent like springs. Then Silver was over the edge of the carpet.

But not falling. She hung at an impossible angle in its safety field, snarling and thrashing at the air.

'No?'

'I Dare Not Go Closer To The Dome.'

'I have the lamp, demon.'

'I Suggest You Do Not Use It.'

Kin saw Marco lift the sword and hesitate. Silver picked up leverage on sheer fresh air, and hurtled towards him.

Shand, kung and carpet disappeared.

Kin stared at the empty space. Below, the sea roared. There was nothing else around but sea, sky and dome, and the horse-faced demon hovering over nothing at all.

Finally she said: 'Demon, what happens if I drop the lamp in the sea? The truth, now.'

'Sometimes Fish Or Crabs Will Brush Against It. Their Wishes Are Simple And Easily Fulfilled.'

'What happened to the carpet?'

'It Disappeared?' said the demon uncertainly.

'I know. Why?'

'Things That Approach Too Close To The Centre Of The World Do So.'

'You didn't tell us.'

'You Didn't Ask Me.'

'Where do they disappear to?'

To? They Just Disappear. That Is All I Know.'

'You'll know more soon' said Kin. She shoved the lamp back into her pocket and urged the horse forward -- towards the dome. Azrifel whimpered.

Presently Kin disappeared.

Kin awoke at the heart of a galaxy strained through a ruby. Touch told her that she was lying on a floor like polished metal, and an old but hitherto unnamed sense assured her that she was inside something. A building. Maybe a cave.

Around her a billion pinpoints of red light glowed. They spread away from her in complicated constellations, climbed the invisible wall tens of metres away and met in the blackness overhead. Sometimes the pattern changed instantly, to be replaced by one equally red and forbidding. It was a pointillist's vision of hell.

Then Kin moved.

Stampede. The lights poured down the walls and clustered around her. She stood up and stamped a foot experimentally. Experiment was the word, and she clung to it. Be rational. Don't go mad.

She thought she had been prepared for anything.

Robots, lasers, long-headed disc builders in silver suits, intelligent slimes -- anything. But not these lights. It wasn't as though they lit anything but themselves.

'Get me out of here,' she growled.

Flash. Now she was standing in an arched corridor, her nostrils filled with the hot metal, ozone and oil smell of machinery. The tunnel was brightly lit by a continuous strip overhead. Pipes and cables snaked along the walls, and the floor was a linear maze of rails. There were distant bangs and thumps, and everywhere there was the hum of hurtling electrons.

Kin picked a direction and walked, carefully avoiding anything that looked highly electric.

So, she told herself, this is the works. I'm down among the cogwheels of the Universe. But it's all wrong. The technology looks ancient. Cogwheels is about right. Good grief!

She was halfway past an alcove giving off from the main tunnel. There was movement in there. Kin started to run for cover, then thought, what the hell?

It was a robot, a big one, shaped the best shape for a robot. Square. One waldo arm was groping in a square hole in the alcove's metal wall. A square panel lay on the floor.

The arm clicked back. It held something small that Kin couldn't quite see properly, which it dropped into a hopper bolted on to the robot's side. A drawer slid out just above the hopper, and this time Kin got a good view of the objects nestling in its padded interior. The arm waved uncertainly above them, then selected one gingerly and carried it into the hole.

While the machine was engaged in its mysterious activities Kin strolled forward and picked one of the objects out of the rack in the drawer. It was about the size of an egg. One end was studded with hundreds of pins, and inside was a filigree of wires, tubes and grids.

Kin had seen things like it in a museum. It was a valve, a sort of neolithic integrated circuit. Only this was a valve such as might be built by someone who had never developed the transistor, so that more and more ingenuity had been devoted to perfecting the existing technology.

It made Kin think of Ehftnic computers. The ehfts had never discovered electronics but they needed computers for their complex religio-banking organizations. So an Ehftnic computer was a thousand highly trained ehfts, each one handling a small part of the maths. It worked.

But she'd be dipped in dogshit before she'd believe that the disc was built by a thermionic valve technology.

The robot's arm whirred out of the wall. The panel was picked up and slotted into place with surprising speed. Almost before Kin could react her new friend was rumbling off down the tunnel. It moved at a fast walking pace. She followed.

She would survive. If They were going to kill her, They would have done it already. She'd live. Provided she didn't bank on it, she'd live.

Once they passed another cuboid robot, wielding some kind of tool over some kind of exposéd circuitry. It could have been a soldering iron. It could have been a printed circuit. Kin couldn't stop to check.

Then Kin's robot reached a robot-shaped slot in the wall. Kin had a brief glimpse of sockets at the back of the slot before the robot reversed in, with all the painstaking care of a fornicating porcupine. It stopped humming. Patently, the repairman had gone dormant.

Kin considered for some time. The tunnels seemed endless. She could wander around in them for days. Then she'd die. But there was an alternative... She went back down the tunnel until she found the soldering robot. Wrenching off one of its arms was difficult, but she managed. She used it to hit the thing until it stopped humming. As an encore she tossed the arm at the exposed circuitry, which sparked satisfyingly.

Then she waited.

When a small, hemispherical robot-repair robot rolled up a few minutes later she overturned it. It hummed at her reproachfully.

The next one was a pear-shaped, multi-lensed blob travelling along a rail near the ceiling of the tunnel. Kin tried to bring it down with pieces of robot, but it swung away hastily.

At least she had made her presence felt. Someone must repair the robots that repaired the robot-repairing robots. All it took was time.

Hours passed before a tank-like machine arrived. It was dented and lacked panelling, and bore the stumps of various delicate manipulatory appendages. If this was the ultimate repairer, Kin supposed, then sheer time could have caused its battered state.

On the other hand, the fact that Marco was sitting on its hull with a robotic arm trailing wires in each hand could have had something to do with it.

'Perhaps there just aren't any facilities for dealing with humans who get into the machinery,' said Kin.

Marco grunted, but didn't look up from his work.

He was doing something neolithic with a length of robot innards, using the small repair hemisphere as a hammer.

'There must be' he said. 'This world must be studded with hidden air ducts, ventilators, power shafts. Humans poke into everywhere. Anyway, we were brought here, remember? Subsequently to ignore us is impolite.'

He stood up. 'Coming?'

'Where?'

'Anywhere with delicate circuitry. This' he waved a robot limb, 'is insulated. For short-circuiting.'

'And the other thing?' asked Kin, her heart sinking.

It was a connected series of arm sections, terminating in a crude but lethal blade. Marco hefted it experimentally.