'Yes,' said Iaia in a dull, faraway voice. 'And she will not be alone in her suffering.'

'Surely, if it was someone here in the house who murdered Lucius, that person cannot stand by and see so many people slaughtered in his stead.'

'Not people,' she corrected, 'slaves.'

'Still-'

'And for slaves to die, even ninety-nine slaves, for the benefit of a great and wealthy man – is that not the Roman way?'

To that, I had no answer. I left her standing by the pool, staring into its sulphurous depths.

In the anteroom Eco stood on the scaffold holding a horsehair brush, while Olympias hovered behind him, her hand laid gendy atop his to guide his strokes. 'A single sweeping motion,' she was saying. 'Lay it on in a thin, even coat.'

'Really, Eco,' I called up to him, 'I had no idea you had a gift for painting.'

He gave a start. Olympias looked over her shoulder with a cheerful smile. 'He has a very steady hand,' she said.

'I'm sure he does. But I think we will take our leave. Come, Eco.' He scrambled nimbly down, looking flushed and slightly disoriented and glancing awkwardly over his shoulder as we stepped into the portico outside.

'Did you press your attentions on her, Eco, or was it Olympias who suggested that you join her on the scaffold?' Eco indicated the latter. 'Ah, it was she who stepped so close, putting her arm around you?' He nodded dreamily, then frowned at the way I pursed my Lips. 'I would not be entirely trusting of that young woman's friendliness, Eco. No, don't be silly; I'm not jealous of you. There's something about the way she smiles that makes me uncomfortable.'

A voice hailed us from behind, and I turned to see Metrobius and Sergius Orata, each attended by a slave. 'Are you on your way to the baths, too?' asked the businessman with a yawn that indicated he had just got out of bed.

'Yes,' I said. Why not?

While Orata and Eco relaxed in the hot pool, I accepted an offer from Metrobius to share his masseur. We stripped and reclined side by side on pallets in the changing room. The slave went back and forth between us, kneading our shoulders and poking at our spines. The slave was a tall, wizened man with extraordinarily strong hands.

'If I were rich,' I grunted, 'I think I would have this done to me every day.'

'I am rich,' said Metrobius, 'and I do. How did you ever get that awful bump on your head?'

'Oh, it's nothing. A doorway was shorter than I expected. Oh! That's good! Yes, there, that spot below my shoulder… These baths are quite wonderful, aren't they? Eco and I came here yesterday, after we first arrived. Mummius wanted to show off the plumbing. He had a massage from the boy who sang last night, Apollonius I think he's called. But I doubt that Apollonius could be half as skilful as your man.'

'I wouldn't know,' said Metrobius cautiously, lying on his side with his head propped on one hand and looking at me with sudden suspicion.

'No? You're such a frequent house guest, I thought you might have taken the opportunity to use this Apollonius yourself'

Metrobius hummed and raised an eyebrow. 'Only Mollio here massages me. He was a gift from Sulla, yean ago. Knows every aching muscle and cracked bone in this tired old body. A callow youth like Apollonius would probably give me a sprain.'

'Yes, I suppose Mummius can take that risk. He's not exactly delicate. Tough as an ox, by the looks of him.'

'And nearly as smart.'

'Oh! Could you do that again, Mollio? For some reason, Metrobius, I don't believe you like Marcus Mummius.' 'I'm indifferent to him.' 'You detest him.'

'I confess. Here, Mollio, attend to me. Gordianus has had enough for the moment.'

I lay in a state of bliss, as limp as pummelled dough. I closed my eyes and saw visions of starfish and octopi, attended by strange gasping noises. It was Metrobius's turn to grunt and wheeze.

'Why does the grudge run so deep?' I asked.

'I never liked Mummius, from the first moment I met him.'

'But there must have been some incident, some offence.'

'Oh, very well.' He sighed. 'This was ten years ago, just after Sulla was made dictator. You remember that Sulla set up the proscription lists and posted them in the Forum, offering rewards to whoever would bring him the heads of his enemies?'

'I remember it well.'

'It was an ugly process, but unavoidable. The Republic had to be purged. For Sulla to restore order and put an end to years of civil war, the opposition had to be eliminated. Otherwise the conflicts and vendettas would have gone on endlessly.'

'And what does this have to do with your feud with Mummius?'

'The estates of Sulla's enemies were made property of the state and sold at public auction. I need not tell you that the first people in line at these so-called public auctions were usually Sulla's close friends and associates. How else could a mere actor like myself end up with a villa on the Cup? But there were others in line ahead of me.'

'Including Mummius?'

'Yes. Crassus was much in favour then, almost as important as Pompey. Eventually he overstepped himself and embarrassed Sulla; you may remember a certain scandal involving an innocent man added to Sulla's lists just so Crassus could obtain the poor man's property.'

'There was more than one such scandal.'

'Yes, but Crassus was a Roman of good birth, a general, the hero of the Colline Gate, thought to be above such grubbiness. Even so, Sulla only slapped his wrists for that offence. But before the scandal, Crassus came first in all things, just behind Pompey. And Crassus's men were to be pampered and coddled, even above many of Sulla's oldest friends and supporters.'

'Like yourself.'

'Yes.'

'I take it Mummius got the best of you in something, and Sulla took his side.'

'There was a certain property we both coveted.' 'Real estate, or a human?' 'A slave.' 'I see.'

'No, you don't. The boy had been the property of a certain senator in Rome. Once I heard him sing at a dinner party. He came from my own hometown in Etruria. He sang in the dialect I learned as a child. To hear him made me weep. When I learned that he was being sold in a lot with the rest of the household slaves, I rushed down to the Forum. The auctioneer happened to be a friend of Crassus's. It turned out that Mummius desired the boy as well, and not for his singing. The auctioneer ignored my bids, and Marcus Mummius was awarded the entire lot of slaves for the price of a used tunic. How smug he was when he passed by me to collect his receipt. We exchanged threats. I drew a knife. The crowd was packed with Crassus's men, and I had to flee for my life while they jeered after me. I went to Sulla, demanding justice, but he refused to intervene. Mummius was too close to Crassus, he said, and at that moment he could not afford to offend Crassus.'

'So Mummius bested you over a boy.'

'That wasn't the end of it. It took him only two years to tire of the slave. Mummius decided to get rid of him, but he refused to sell him to me, purely out of spite. By then, Sulla was dead and I had no influence at Rome. I wrote a letter to Mummius and asked him as humbly as I could to let me buy the boy. Do you know what he did? He passed the letter around at a dinner party and made a joke of it. And then he passed the boy around. He made sure I heard all about it.'

'And the boy?'

'Mummius sold him to a slave trader bound for Alexandria. The boy disappeared forever. Mollio!' he snapped. 'Your hands are useless this morning!'

'Patience, master,' cooed the wizened slave. 'Your spine is as stiff as wood. Your shoulders are like rusty hinges.'

The door opened. A rush of cool air brought with it the high, piping voice of Sergius Orata. 'And more ducts run under this floor and along both of these walls,' he was saying. 'You can see the vents that release the hot air, spaced evenly apart.' Eco followed him, nodding without much enthusiasm. Orata was naked except for a very large towel wrapped around his middle. Clouds of steam rose from his plump pink flesh.