'You're coming with me,' she said.

'Yes,' said Ling. 'It is my job to stay with you.'

'How will we get home?'

'I will follow you there.'

A lizard scuttled across their path into shadow and froze, watchful, its throat pumping.

'What do you see?' Mae asked him.

'Many corridors,' said the dog. 'No ceiling.'

'That is called the sky,' said Mae.

The dog paused and then was pumped with Info. 'Oh, yes,' he said. 'I see it is the sky now.'

They walked. Overhead hawks circled looking for desert mice.

'I want to hunt,' said Ling.

'No. Not yet. Later. You have a job,' said Mae.

Ahead of them were the mountains, soft and rounded in the nearer layers, then rising up, one after another, back into the hills, back to the sharply folded crags, the snow. Mae had a vague plan, to walk through the undeveloped plain around the town.

Already they were pushing their way through a hedge, into a dust track leading to the outskirts of a village. A handsome green mosque rose up above mud huts, and there was a smell of billy goat. Two women were making dungcakes. They turned leathery desert-plain faces to her, not quite believing what they saw.

A naked Chinese woman, they would later say, with a dog wearing a metal hat.

Mae pushed her way through another hedge, and walked across a field of straw.

'When do we eat?' Ling asked.

'I don't know,' said Mae. Something seemed to go pop in her head. Her thinking was clearing.

'Ling feels unloved if he is not fed, 'warned the computer on his head. 'He becomes anxious and unreliable.'

'There is a big juicy steak at home and a bowl of water,' promised Mae.

Water dripped from Ling's panting tongue. 'That sounds good,' he said. 'I can see the steak,' he said. 'I can smell it.' The computer was feeding him.

'Good dog. Good boy,' said Mae, feeling sorry for him – for being fooled, for being possessed. It made her feel they had things in common.

The city had spread beyond its old boundaries. Mae paused at the edge of a road. There was nothing for it but for Mae to keep walking. The streets were bright, broken. Traffic idled past her, heads turned. A woman shouted something about covering herself up, drunken woman.

The dog turned and growled, baring teeth in black jaws.

Why are they all so worried? wondered Mae. My shift is as long as my knees, and some of us are still so poor we wander barefoot. A teenage boy, all in sleeping-bag clothes stepped out, then stepped back into a small bookshop and called to his friends. A man helpless in a barber's chair stared at her as she passed, his face going slack and open.

'The world is so big,' said Ling. A man in old, stiff clothes and a peasant's cap dropped a bag of tools.

'These are all houses for people,' said Mae.

'Where does the world stop?' asked Ling.

The man began to follow.

'It never stops,' said Mae.

'Your… Your dog is talking,' said the man.

Ling thought he was being praised and turned back to sniff the man. He was a hard Karz villager with a face that looked as though someone had smashed it with a plank of wood, stubble-black chin merging with huge moustache. He backed away in alarm.

'They do it in the Air,' said Mae, explaining, wanting him to know it was nothing extraordinary. 'It is like a radio in his head and in his throat.'

The man began to shake his head over and over. He wiped away the world with his hand. 'I fix cars,' he said. He turned back. 'The dog understands?'

'I want to,' said Ling.

The man gazed into the dog's soft black eyes, as if he could fall into them and disappear. 'Tuh,' was all he said, the sound of his world changing, suddenly, for real. He picked up his bag of tools. Ling sniffed them experimentally. Dazed, the man scratched his head and turned away.

The boys from the bookshop stared.

Mae gave them a little wave and walked on.

The streets began to climb steeply.

'How far to the steak?' Ling asked.

'Oh, perfect boy, lovely fellow,' said Mae. 'It is a long way but we will talk.'

'What is the world like to you?' Ling asked her.

'Right now, I am drugged. So everything is very strange. Like it is for you.'

A woman came up to her and wordlessly pressed into Mae's hands a pair of plastic sandals. The plastic was clear and full of silver}' flakes that reflected and caught the sunlight. The woman's eyes were ringed with mascara, full of outrage and pity. She wore a purple jacket and Western-woman working boots.

'May I suggest a light mauve scarf with a such a strongly coloured jacket?' said Mae.

Mae, she told herself, your mind. Your mind is not working properly yet.

The woman's face did not change, but she walked away quickly.

Mae walked on in her silver shoes to where the road turned off, towards the sign for home, and she looked back over the city with its trees and light. Shadows were slightly longer, sunlight and shadow were balanced in the foul blue air. It looked cooler, golden, mauve. Rising up out of the light was the Great Saudi mosque, made of frosted crystal, dancing quotes from the Koran catching the sunlight to be illuminated from within.

A long bronze-reflecting limousine coasted to a halt beside her. A window slid open like the protective lens of a lizard's eye, and Mr Tunch leaned out.

Mae felt terror, only the terror could not fight its way to the surface of her face, her limbs, or down into the pit of her stomach.

I'm caught, she thought blandly.

'Hello, Mae,' said Wisdom Bronze. They both waited. He pushed open the door on the other side of the car. 'Let me drive you home.'

Mae could not move. Part of her wanted to cry. Her eyes tried to cry, but the drugs prevented it.

Ling looked back and forth, back and forth.

'Mae?' he pleaded for direction.

'Get in,' she said, in a voice so soft only a dog could hear.

'He said we're going home,' said the dog. He climbed into the backseat, next to Mae's old best dress.

Mr Tunch was doing his own driving. 'I meant what I said, Mae.' His eyes were blanked out by glasses. 'There's something I want to explain.'

Something seemed to pop in Mae's head again. Something told her the walking had been good, it had made the drugs worse, but they'd be over with sooner. The thought meant she had not yet got into the car.

'Don't be silly, Mae, you are not important enough to me to hurt you.'

She got in the front seat.

'Me,' whimpered Ling, and, claws clattering, climbed onto Mae's lap. His feet dug in for something to grab.

'Ouch,' said Mae.

'Hold me,' said Ling, and she realized he was afraid. He ached for the window, where there were smells, the world he truly believed in.

Mae hoisted him around so that he sat on her lap comfortably.

'All in?' asked Tunch, as if they were a family on an outing.

The car went in the right direction.

'What will happen to you back home?' Tunch asked.

Mae considered. 'I will be an outcast. It will make helping the village very difficult, for they will not listen to me.' Pop, went her head, clearing again. She began to be aware of the light breeze of fear blowing through her.

'You won't take the drugs?' he asked.

Mae shook her head.

He had to change gear, glancing in the mirror at the future behind them. 'That is probably wise. It will leave you with a clearer head. But when you and Mrs Tung feel the same thing, she will emerge.'

'I can beat her off,' said Mae. 'Except when people interfere.'

'Sorry,' said Tunch.

Mae could have said a lot of things. Do you say 'Sorry' to the wives of men you kill? Or do you just threaten? How do you keep all your separate selves apart? I hope you manage to keep the small-time assassin separate from the man who wants to rule.