'Crazy, you mean?' Cleve said, only half-joking.

'Something like that,' Billy replied, eyes still on the wall. He sighed, then allowed himself a further confession. 'That's why I came here. So my grandfather would know he hadn't been forgotten.'

'Came here?' said Cleve. 'What are you talking about? You were caught and sentenced. You had no choice.'

The light on the wall was extinguished as a cloud passed over the sun. Billy looked up at Cleve. The light was there, in his eyes.

'I committed a crime to get here,' the boy replied. 'It was a deliberate act.'

Cleve shook his head. The claim was preposterous.

'I tried before: twice. It's taken time. But I got here, didn't I?'

'Don't take me for a fool, Billy,' Cleve warned.

'I don't,' the other replied. He stood up now. He seemed somehow lighter for the story he'd told; he even smiled, if tentatively, as he said: 'You've been good to me. Don't think I don't know that. I'm grateful. Now - ' he faced Cleve before saying: 'I want to know where the graves are. Find that out and you won't hear another peep from me, I promise.'

Cleve knew next to nothing about the prison or its history, but he knew somebody who did. There was a man by the name of Bishop -so familiar to the inmates that his name had acquired the definite article - who was often at the Workshop at the same time as Cleve. The Bishop had been in and out of prison for much of his forty odd years, mostly for minor misdemeanours, and - with all the fatalism of a one-legged man who makes a life-study of monopedia - had become an expert on prisons and the penal system. Little of his information came from books. He had gleaned the bulk of his knowledge from old lags and screws who wanted to talk the hours away, and by degrees he had turned himself into a walking encyclopaedia on crime and punishment. He had made it his trade, and he sold his carefully accrued knowledge by the sentence; sometimes as geographical information to the would-be escapee, sometimes as prison mythology to the godless con in search of a local divinity. Now Cleve sought him out, and laid down his payment in tobacco and IOUs.

'What can I do for you?' The Bishop asked. He was heavy, but not unhealthily so. The needle-thin cigarettes he was perpetually rolling and smoking were dwarfed by his butcher's fingers, stained sepia by nicotine.

'I want to know about the hangings here.'

The Bishop smiled. 'Such good stories,' he said; and began to tell.

On the plain details, Billy had been substantially correct. There had been hangings in Pentonville up until the middle of the century, but the shed had long since been demolished. On the spot now stood the Probation Office in B Wing. As to the story of Crippen's roses, there was truth in that too. In front of a hut in the grounds, which, The Bishop informed Cleve, was a store for gardening equipment, was a small patch of grass, in the centre of which a bush flourished, planted (and at this point The Bishop confessed that he could not tell fact from fiction) in memory of Doctor Crippen, hanged in 1910.

'That's where the graves are?' Cleve asked.

'No, no,' The Bishop said, reducing half of one of his tiny cigarettes to ash with a single inhalation. The graves are alongside the wall, to the left behind the hut. There's a long lawn; you must have seen it.'

'No stones?'

'Absolutely not. The plots have always been left unmarked. Only the Governor knows who's buried where; and he's probably lost the plans.' The Bishop ferreted for his tobacco tin in the breast-pocket of his prison-issue shirt and began to roll another cigarette with such familiarity he scarcely glanced down at what he was doing. 'Nobody's allowed to come and mourn you see. Out of sight, out of mind: that's the idea. Of course, that's not the way it works, is it? People forget Prime Ministers, but they remember murderers. You walk on that lawn, and just six feet under are some of the most notorious men who ever graced this green and pleasant land. And not even a cross to mark the spot. Criminal, isn't it?'

'You know who's buried there?'

'Some very wicked gentlemen,' the Bishop replied, as if fondly admonishing them for their mischief-mongering.

'You heard of a man called Edgar Tait?'

Bishop raised his eyebrows; the fat of his brow furrowed. 'Saint Tait? Oh certainly. He's not easily forgotten.'

'What do you know about him?'

'He killed his wife, and then his children. Took a knife to them all, as I live and breathe.'

'All?'

The Bishop put the freshly-rolled cigarette to his thick lips. 'Maybe not all,' he said, narrowing his eyes as he tried to recall the specific details. 'Maybe one of them survived. I think perhaps a daughter ...' he shrugged dismissively. 'I'm not very good at remembering the victims. But then, who is?' He fixed his bland gaze on Cleve. 'Why are you so interested in Tait? He was hanged before the war.'

'1937. He'll be well gone, eh?'

The Bishop raised a cautionary fore-finger. 'Not so,' he said. 'You see the land this prison is built upon has special properties. Bodies buried here don't rot the way they do elsewhere.' Cleve shot The Bishop an incredulous glance. 'It's true,' the fat man protested mildly, 'I have it on unimpeachable authority. Take it from me, whenever they've had to exhume a body from the plot it's always been found in almost perfect condition.' He paused to light his cigarette, and drew upon it, exhaling the smoke through his mouth with his next words. 'When the end of the world is upon us, the good men of Marylebone and Camden Town will rise up as rot and bone. But the wicked?; they'll dance to Judgement as fresh as the day they dropped. Imagine that.' This perverse notion clearly delighted him. His pudgy face puckered and dimpled with pleasure at it. 'Ah,' he mused, 'And who'll be calling who corrupt on that fine morning?'

Cleve never worked out precisely how Billy talked his way on to the gardening detail, but he managed it. Perhaps he had appealed directly to Mayflower, who'd persuaded his superiors that the boy could be trusted out in the fresh air. However he worked the manoeuvre, in the middle of the week following Cleve's discovery of the graves' whereabouts, Billy was out in the cold April morning cutting grass.

What happened that day filtered back down the grapevine around recreation time. Cleve had the story from three independent sources, none of whom had been on the spot. The accounts had a variety of colorations, but were clearly of the same species. The bare bones went as follows:

The gardening detail, made up of four men overlooked by a single prison officer, were moving around the blocks, trimming grass and weeding beds in preparation for the spring planting. Custody had been lax, apparently. It was two or three minutes before the officer even noticed that one of his charges had edged to the periphery of the party and slipped away. The alarm was raised. The officers did not have to look far, however. Tait had made no attempt to escape, or if he had he'd been stymied in his bid by a fit of some kind, which had crippled him. He was found (and here the stories parted company considerably) on a large patch of lawn beside the wall, lying on the grass. Some reports claimed he was black in the face, his body knotted up and his tongue all but bitten through; others that he was found face down, talking to the earth, weeping and cajoling. The consensus was that the boy had lost his mind.

The rumours made Cleve the centre of attention; a situation he did not relish. For the next day he was scarcely left alone; men wanting to know what it was like to share a cell with a lunatic. He had nothing to tell, he insisted. Tait had been the perfect cell-mate -quiet, undemanding and unquestionably sane. He told the same story to Mayflower when he was grilled the following day; and later, to the prison doctor. He let not a breath of Tait's interest in the graves be known, and made it his business to see The Bishop and request a similar silence of him. The man was willing to oblige only if vouchsafed the full story in due course. This Cleve promised. The Bishop, as befitted his assumed clerity, was as good as his word.