Cicero glanced away, peering into the translucent folds of the yellow curtain, as if he could see beyond it all the human refuse of Rome. 'Where do they all come from?' he muttered.

'They grow up through the pavement,' I said, 'like weeds. Or they drift in from the countryside, refugees from war after war. Think about it: Sulla wins his war against the rebellious Italian allies and pays his soldiers in land. But to acquire that land, the defeated allies must first be uprooted. Where do they end up, except as beggars and slaves in Rome? And all for what? The countryside is devastated by war. The soldiers know nothing of farming; in a month or a year they sell their holdings to the highest bidder and head back to the city. The countryside falls into the grip of vast landholders. Small farmers struggle to compete, are defeated and dispossessed — they find their way to Rome. More and more I've seen it in my own lifetime, the gulf between the rich and poor, the smallness of the one, the vastness of the other. Rome is like a woman of fabulous wealth and beauty, draped in gold and festooned with jewels, her belly big with a foetus named Empire — and infested from head to foot by a million scampering lice.'

Cicero frowned. 'Hortensius warned me that you would talk politics.'

'Only because politics is the air we breathe — I inhale a breath, and what else could come out? It may be otherwise in other cities, but not in the Republic, and not in our lifetimes. Call it politics, call it reality. The gangs exist for a reason. No one can get rid of them. Everyone fears them. A man bent on murder would find a way to use them. He'd only be following the example of a successful politician.'

'You mean—'

'I don't mean any particular politician. They all use the gangs, or try to.'

'But you mean Sulla.'

Cicero spoke the name first. I was surprised. I was impressed. At some point the conversation had slipped out of control. It was quickly turning seditious.

'Yes,' I said 'If you insist: Sulla.' I looked away. My eyes fell on the yellow curtain. I found myself gazing at it and into it, as if in the vagueness of the shapes beyond I could make out the images of an old nightmare. 'Were you in Rome when the proscriptions began?'

Cicero nodded.

'So was I. Then you know what it was like. Each day the new list of the proscribed would be posted in the Forum. And who were always first in line to read the names? No, not anyone who might have been on the list, because they were all cowering at home, or wisely barricaded in the countryside. First in line were the gangs and their leaders — because Sulla didn't care who destroyed his enemies, or his imagined enemies, so long as they were destroyed. Show up with the head of a proscribed man slung over your shoulder, sign a receipt, and receive a bag of silver in exchange. To acquire that head, stop at nothing. Break down the doors of a citizen's house. Beat his children, rape his wife — but leave his valuables in place, for once head and body are parted, the property of a proscribed Roman becomes the property of Sulla.'

'Not exactly…'

'I misspoke, of course. I meant to say that when an enemy of the state is beheaded, his estate is confiscated and becomes property of the state — meaning that it will be auctioned at the earliest convenient date at insanely low prices to Sulla's friends.'

Even Cicero blanched at this. He concealed his agitation well, but I noticed his eyes shift for the briefest instant from side to side, as if he were wary of spies concealed among the scrolls. ‘You're a man of strong opinions, Gordianus. The heat loosens your tongue. But what has any of this to do with the subject at hand?'

I had to laugh. 'And what is the subject? I think I've forgotten.'

'Arranging a murder,' Cicero snapped, sounding for all the world like a teacher of oratory attempting to steer an unruly pupil back to the prescribed topic. 'A murder of purely personal motive.'

‘Well, then, I'm only trying to point out how easy it is these days to find a willing assassin. And not only in the Subura. Look on any street corner — yes, even this one. I'd gladly wager that I could leave your door, walk around the block exactly once, and return with a newfound friend more than willing to murder my pleasure-loving, whoremongering, hypothetical father.'

'You go too far, Gordianus. Had you been trained in rhetoric, you'd know the limits of hyperbole.'

'I don't exaggerate. The gangs have grown that bold. It's Sulla's fault and no one else's. He made them his personal bounty hunters.

He unleashed them to run wild across Rome, like packs of wolves. Until the proscriptions officially ended last year, the gangs had almost unlimited power to hunt and kill. So they bring in the head of an innocent man, a man who's hot oh the list — so what? Accidents happen. Add his name to the list of the proscribed. The dead man becomes a retroactive enemy of the state. What matter if that means his family will be disinherited, his children ruined and reduced to paupers, fresh fodder for the gangs? It also means that some friend of Sulla's will acquire a new house in the city.'

Cicero looked as if a bad tooth were worrying him. He raised his hand to silence me. I raised my own hand to stave him off.

'I'm only now reaching my point. You see, it wasn't only the rich and powerful who suffered during the proscriptions, and still suffer. Once Pandora's box is opened, no one can close it. Crime becomes habit. The unthinkable becomes commonplace. You don't see it from here, where you live. This street is too narrow, too quiet. No weeds grow through the paving stones that run by your door. Oh, no doubt, in the worst of it, you had a few neighbours dragged from their homes in the middle of the night. Perhaps you have a view of the Forum from the roof and on a clear day you might have counted the new heads added to the pikes.

'But I see a different Rome, Cicero, that other Rome that Sulla has left to posterity. They say he plans to retire soon, leaving behind him a new constitution to strengthen the upper classes and put the people in their place. And what is that place, but the crime-ridden Rome that Sulla bequeaths to us? My Rome, Cicero. A Rome that breeds in shadow, that moves at night, that breathes the very air of vice without the disguises of politics or wealth. After all, that's why you've called me here, isn't it? To take you into that world, or to enter it myself and bring back to you whatever it is you're seeking. That's what I can offer you, if you're seeking the truth.'

At that moment Tiro returned, bearing a silver tray set with three cups, a round loaf of bread, dried apples, and white cheese. His presence instantly sobered me. We were no longer two men alone in a room discussing politics, but two citizens and a slave, or two men and a boy, considering Tiro's innocence. I would never have spoken so recklessly had he never left the room. I feared I had said too much already.