Billy was gone from the fold for two days. In the interim Mayflower disappeared from his duties as Landing Officer. No explanation was given. In his place, a man called Devlin was transferred from D Wing. His reputation went before him. He was not, it seemed, a man of rare compassion. The impression was confirmed when, the day of Billy Tait's return, Cleve was summoned into Devlin's office.

'I'm told you and Tait are close,' Devlin said. He had a face as giving as granite.

'Not really, sir.'

'I'm not going to make Mayflower's mistake, Smith. As far as I'm concerned Tait is trouble. I'm going to watch him like a hawk, and when I'm not here you're going to do it for me, understand? If he so much as crosses his eyes it's the ghost train. I'll have him out of here and into a special unit before he can fart. Do I make myself clear?'

'Paying your respects, were you?'

Billy had lost weight in the hospital; pounds his scrawny frame could scarcely afford. His shirt hung off his shoulders; his belt was on its tightest notch. The thinning more than ever emphasized his physical vulnerability; a featherweight blow would floor him, Cleve thought. But it lent his face a new, almost desperate, intensity. He seemed all eyes; and those had lost all trace of captured sunlight. Gone, too, was the pretense of vacuity, replaced with an eerie purposefulness.

'I asked a question.'

'I heard you,' Billy said. There was no sun today, but he looked at the wall anyway. 'Yes, if you must know, I was paying my respects.'

'I've been told to watch you, by Devlin. He wants you off the Landing. Transferred entirely, maybe.'

'Out?' The panicked look Billy gave Cleve was too naked to be met for more than a few seconds. 'Away from here, you mean?'

'I would think so.'

They can't!'

'Oh, they can. They call it the ghost train. One minute you're here; the next -'

'No,' the boy said, hands suddenly fists. He had begun to shake, and for a moment Cleve feared a second fit. But he seemed, by act of will, to control the tremors, and turned his look back to his cellmate. The bruises he'd received from Lowell had dulled to yellow-grey, but far from disappeared; his unshaven cheeks were dusted with pale-ginger hair. Looking at him Cleve felt an unwelcome twinge of concern. 'Tell me.' Cleve said. Tell you what?' Billy asked. 'What happened at the graves.'

'I felt dizzy. I fell over. The next thing I knew I was in hospital.'

'That's what you told them, is it?'

'It's the truth.'

'Not the way I heard it. Why don't you explain what really happened? I want you to trust me.'

'I do,' the boy said. 'But I have to keep this to myself, see. It's between me and him.'

'You and Edgar?' Cleve asked, and Billy nodded, 'A man who killed all his family but your mother?'

Billy was clearly startled that Cleve possessed this information. 'Yes,' he said, after consideration. 'Yes, he killed them all. He would have killed Mama too, if she hadn't escaped. He wanted to wipe the whole family out. So there'd be no heirs to carry the bad blood.'

'Your blood's bad, is it?'

Billy allowed himself the slenderest of smiles. 'No,' he said. 'I don't think so. Grandfather was wrong. Times have changed, haven't they?'

He is mad, Cleve thought. Lightning-swift, Billy caught the judgement.

'I'm not insane,' he said. 'You tell them that. Tell Devlin and whoever else asks. Tell them I'm a lamb.' The fierceness was back in his eyes. There was nothing lamb-like there, though Cleve forbore saying so. 'They mustn't move me out, Cleve. Not after getting so close. I've got business here. Important business.'

'With a dead man?'

'With a dead man.'

Whatever new purpose he displayed for Cleve, the shutters went up when Billy got back amongst the rest of the cons. He responded neither to the questions nor the insults bandied about; his facade of empty-eyed indifference was flawless. Cleve was impressed. The boy had a future as an actor, if he decided to forsake professional lunacy.

But the strain of concealing the new-found urgency in him rapidly began to tell. In a hollowness about the eyes, and a jitteriness in his movements; in brooding and unshakeable silences. The physical deterioration was apparent to the doctor to whom Billy continued to report; he pronounced the boy suffering from depression and acute insomnia, and prescribed sedatives to aid sleep. These pills Billy gave to Cleve, insisting he had no need of them himself. Cleve was grateful. For the first time in many months he began to sleep well, unperturbed by the tears and shouts of his fellow inmates.

By day, the relationship between he and the boy, which had always been vestigial, dwindled to mere courtesy. Cleve sensed that Billy was closing up entirely, removing himself from merely physical concerns.

It was not the first time he had witnessed such a pre-medicated withdrawal. His sister-in-law, Rosanna, had died of stomach cancer three years previous: a protracted and, until the last weeks, steady decline. Cleve had not been close to her, but perhaps that very distance had lent him a perspective on the woman's behaviour that the rest of his family had lacked. He had been startled at the systematic way she had prepared herself for death, drawing in her affections until they touched only the most vital figures in her life -her children and her priest - and exiling all others, including her husband of fourteen years.

Now he saw the same dispassion and frugality in Billy. Like a man in training to cross a waterless wasteland and too possessive of his energies to squander them in a single fruitless gesture, the boy was sinking into himself. It was eerie; Cleve became increasingly uncomfortable sharing the twelve feet by eight of the cell with Billy. It was like living with a man on Death Row.

The only consolation was the tranquillisers, which Billy readily charmed the doctor into continuing to supply. They guaranteed Cleve sleep that was restful, and, for several days at least, dreamless.

And then he dreamt the city.

Not the city first; first the desert. An empty expanse of blue-black sand, which stung the soles of his feet as he walked, and was blown up by a cool wind into his nose and eyes and hair. He had been here before, he knew. His dream-self recognized the vista of barren dunes, with neither tree nor habitation to break the monotony. But on previous visits he had come with guides (or such was his half-formed belief); now he was alone, and the clouds above his head were heavy and slate-grey, promising no sun. For what seemed hours he walked the dunes, his feet turned bloody by the sharp sand, his body, dusted by the grains, tinged blue. As exhaustion came close to defeating him, he saw ruins, and approached them.

It was no oasis. There was nothing in those empty streets of health or sustenance; no fruitful trees nor sparkling fountains. The city was a conglomeration of houses, or parts of same - sometimes entire floors, sometimes single rooms - thrown down side by side in parodies of urban order. The styles were a hopeless mish-mash - fine Georgian establishments standing beside mean tenement buildings with rooms burnt out; a house plucked from a terraced row, perfect down to the glazed dog on the window sill, back to back with a penthouse suite. All were scarred by a rough removal from their context: walls were cracked, offering sly glimpses into private interiors; staircases beetled cloudward without destination; doors flapped open and closed in the wind, letting on to nowhere.

There was life here, Cleve knew. Not just the lizards, rats and butterflies - albinoes all - that fluttered and skipped in front of him as he walked the forsaken streets - but human life. He sensed that every step he took was overlooked, though he saw no sign of human presence; not on his first visit at least.