Claudia nodded at her uncle and aunt, picked up an oil lamp and peered closer. She felt the skin of the face; it was like touching a wax sponge. In the stronger light she noticed the reddish-gold dust on the side of the neck, how the cheeks were sunken, the jaw slightly drooping. She took her hand away. 'What is this?' She felt the powder between her fingers.

'It was on the side of the casket,' Apuleius explained. 'Probably from the wood.'

Claudia nodded and returned to her examination. She leaned down and sniffed the fragrance of wild flowers. She touched the hair; it was slightly dry and brittle. She rearranged the linen folds slightly and noticed the faded dark contusions on the side of the neck and along the shoulders. She went to raise the linen robes but Apuleius tapped her hand.

'I don't think we should,' he whispered. 'I've never seen the like before.' He pointed at the top of the casket and around the rim. Claudia made out the Christian symbols: the chi and rho as well as crudely etched crosses and fishes.

Polybius handed over two denarii, darkened with age. 'These were found on the eyes.'

'None on the mouth?'

'Of course not,' Apuleius remarked. 'I'm a Christian too. We wouldn't use a coin to pay Charon, the Lord of Hell. We don't believe in such things.'

'What exactly happened?' Claudia asked.

'Not here.' Polybius asserted himself. He picked up the lid of the casket and Claudia glimpsed the small crosses etched along the inside. She helped her uncle position the lid back on, noticing the rusting clamps and how the side of the coffin looked shabby and dirt-streaked, slightly rotting, even though the wood was the finest elm. It had definitely been in the ground for some time. She picked up a lamp and studied the twin denarii. They were mildewed with age but she made out the likeness of the curly-haired and bearded Diocletian, whilst the names and titles of the Emperor were inscribed round the rim.

'Diocletian!' she exclaimed. 'But he abdicated about ten years ago to grow his cabbages. He ruled for how long?' She screwed her eyes slightly. 'About twenty years?'

'Long before my time,' Polybius declared. 'I bought this tavern about four years ago.'

'And who owned it before that?'

'One of Maxentius' men,' Polybius remarked. 'Before the civil war ended he fled or was killed.' His sweat-soaked face puckered in concern. 'Don't let's talk here.' He shrugged. 'Let's drink a little wine.'

Polybius led them out of the cellar, leaving Oceanus and Mercury the Messenger to guard the door, which was locked and bolted. He also promised Simon the Stoic and Petronius the Pimp a free evening meal if they helped to protect what was now commonly being called the 'Great Miracle'. Poppaoe fled up into the kitchen to cut bread and cold sausage while her husband led Venutus, Apuleius and his wife as well as Claudia and Murranus out to a table in the shade of the small orchard. Sorry and Caligula, both sensing this was an important meeting, fled, though not before Polybius had told the boy that Poppaoe should bring out a jug of dry white wine, the best from northern Campania.

Once the wine had been served, Claudia learned what had happened. Venutus and his diggers had arrived just before dawn, and began work on the wrong side of the garden. They had cleared a pit of about six feet when their mattocks hit wood. Polybius, busy in the tavern, hadn't noticed where they were or what they were doing until he was summoned out. He immediately told Venutus and his men to break their fast in the eating hall whilst he, Oceanus and Narcissus lifted the coffin out, opened the clasps and found what Claudia had just seen.

'I was confused,' Polybius took a mouthful of wine, 'and so concerned I sent a messenger to the Captain of the Vigiles: that ugly bugger will be here soon. You know the law, Claudia: if murder is suspected or I am myself accused of secretly burying the corpse…' He let his words hang in the air.

Claudia knew the penalty for such crimes: possible confiscation, even crucifixion, or at the very least, slavery in the mines of Syracuse.

'But you're not responsible.'

'Of course he isn't,' Apuleius interrupted. The apothecary sidled on to the bench beside his wife, who sat hunched like a frightened dormouse. 'I'm a healer and physician.' Apuleius smiled. 'Your uncle trusts me, so I immediately hurried here when he sent for me. Callista brought my satchel of instruments and potions.'

'And you examined the corpse?'

'Oh yes, that's why Callista came,' Polybius said. 'The girl was naked.' 'What!'

'True.' Polybius held Claudia's gaze. 'As naked as a newborn baby except for a thin linen drape.'

'It's true,' Callista murmured. 'I asked Poppaoe to fetch some fresh linen; I thought it was decent. I thought-'

'Then I had her moved,' Apuleius intervened, gesturing up at the sky. 'The sun, the heat… the coolest place is the cellar. The rest you know.'

'But this is impossible,' Claudia exclaimed. 'That corpse must have been buried at least, what, nine, ten years ago? Yet, judging from the face at least, no decomposition, no corruption has apparently occurred.'

'I can't explain it,' Apuleius confessed. 'I've examined that corpse, and apart from those bruises there's no other mark of violence.'

'So what can explain it?'

Apuleius opened his mouth to reply, then glanced quickly at his wife.

'I'm reluctant to speak,' Callista confessed, blinking quickly. 'I'm glad Polybius summoned us. My husband is a peritus, an expert, but wc are also Christians. Apuleius recognised those symbols.' She paused and took a deep breath. 'That young woman, according to my husband, probably died a virgin.'

'Excuse me.' Claudia held up her hand and stared round. 'Where's Narcissus the Neat?' she asked. 'He was a professional embalmer; perhaps he could help?'

'Of course he can!' Polybius agreed. 'He too examined the corpse and agreed with Apuleius' conclusion. However, I've sent him out to discover all he can about what happened in this place during Diocletian's reign.'

'Sorry.' Claudia turned back to the apothecary's wife. 'Do continue, you were telling us of a possibility.'

'She may have died a violent death,' Callista declared. 'That bruising to her neck and shoulders…' She paused, then her words came out in a rush. 'During the reign of Dicoletian, Christians, as you know, were savagely persecuted. Young maidens were often interrogated and, in return for sexual favours, promised their freedom. Sometimes the questioning took place in private houses. I believe,' Callista stumbled over her words, 'this was the fate of our young woman. She was a Christian, brought into the city close to the Flavian Gate, interrogated and offered her freedom in return for sexual favours. She refused and was beaten or strangled, or maybe her heart gave out.' 'But why bury her?'

'Perhaps she was of good family.' Apuleius spoke up. 'She had not been brought to trial, so her killer may have become very frightened. He stripped the corpse and bought that casket. Being superstitious, he hastily prepared it, etched on the Christian symbols and buried her here.' He paused. 'If Christians had buried her, they'd have returned to reclaim the corpse. Mind you,' he added sharply, 'there's another possibility – our corpse was secretly buried by Christians who themselves died before the persecution ended and so all memory of her was forgotten.'

'It's possible,' Polybius agreed. 'During the Great Persecution and the consequent civil war, many properties out here were left empty. This garden, when I took over the tavern, was uncultivated.'

'But all this doesn't account for the preservation of the corpse,' Claudia insisted.

'Ah well.' Polybius gestured at Apuleius. 'You explain.'

'That young woman,' the apothecary replied, 'was a martyr, a saint. God preserved her body as a sign of her sanctity.'