When finally I let her go Helena became aware of the crowd. She remembered we were in the refined Capena Gate sector, home of her illustrious parents. 'There are rules, Falco!' she muttered hotly.

I had heard that in patrician circles husbands had to make appointments three days ahead if they wanted to embrace their wives. 'I know the rules. I felt like changing them.'

'Do it again, and I'll jab my knee somewhere painful.'

I kissed her again, so she applied the knee, though her nerve failed and it was too gentle to do damage. The crowd applauded anyway.

Helena looked upset; she thought she had hurt me. 'Goodbye Marcus!'

'Goodbye, my darling,' I responded in a pained croak. Now she suspected me of feigning.

Helena strode to her father's house in her most frosty style. I watched her right to the door, with my arms folded. While she waited for the porter, whose attentions at the door were always haphazard, she turned back furtively to check that I was gone. I grinned and then left, knowing she was safe. Her family would lend her an escort of slaves when she wanted to go back to the Aventine.

After the tension at Marina's I felt stiff and in need of action. I made a detour for some weight training. There was plenty for a man to do at the gymnasium. I managed to linger for hours.

'We're seeing a lot of this customer lately,' Glaucus commented in his wry way. 'You guessed it; the customer is trying to avoid his family!' Calmer, I nearly put off further investigation. But kissing Helena publicly in the street had reminded me of my preference for kissing her more privately. If Petronius decided to arrest me there would be no point struggling to rehouse us, but if I could manage to keep out of jail, new furniture for my wrecked apartment was a priority.

'Petronius was looking for you,' Glaucus warned me. My trainer had a restrained way of speaking that could play on my worst fears.

'Skip it. I'm avoiding Petro as well:'

I didn't care whether or not I interviewed my father, but Petronius Longus would never expect to find me in his company, so a visit to Geminus promised me some breathing-space. Besides, where my father was I might find a cheap bed. So I set off for the Saepta Julia.

With my cloak around my ears, I emerged from the bathhouse into the Forum, skulked past the Temple of Fortune below the Citadel, and furtively made for the Theatre of Marcellus, my starting-point for a hike into the Campus Martius. Everyone I passed seemed to look at me twice, as if my tunic had a foreign cut or my face was a suspicious shape.

Now that I was going to see Geminus my sour mood returned. I still felt restless. Little did I know I was heading for a chance to expend real energy.

Many public buildings have been inflicted on the Campus by men who thought they ought to be famous-all those pompously named theatres, baths, porticoes and crypts, with the occasional temple or circus to keep the tourists agape. I passed through without noticing them; I was too busy looking out for officers of the watch, in case Petronius had instructed them to look out for me.

The Saepta Julia lay between the Baths of Marcus Agrippa and a Temple of Isis; it had the Temple of Bellona at the end nearest my approach. I took a long detour round the Flaminian Circus, partly to stay unobtrusive. I was too bored to go straight up the road which reaches the Saepta the simple way. I came out near Pompey's Theatre, facing the long Porticus in front of it. I could hear a lot of noise, so I turned my boots that way.

The Porticus of Pompey was the usual impressive enclosure. Heavy architecture on four sides formed a secluded interior space where men could hang about pretending to admire works of art while they hoped something more lively would turn up: an invitation to dinner, a quarrel, an expensive boy with a body like a Greek god, or at least a cheap female prostitute. Today the interior was stuffed with goods and people. No need for me to walk further: an auction was being held there, supervised by none other than my loathed papa.

The goods he was shifting looked authentic from a distance and only mildly dubious from closer to. He knew the trade.

I could hear him up on his trestle, trying to cajole bids. He had a slow, unsensational voice that carried effortlessly round the inner quadrangle. From his vantage point above the crowd I presumed he would soon see me. I made no attempt at contact. We would be face to face and quarrelling soon enough.

He was trying to rustle up interest in a mixed batch of folding stools. 'Look at this one: pure ivory; beautifully carved. Probably from Egypt. The noble Pompey himself might have sat on it-'

'Pompey had his noble head cut off in Egypt!' a heckler called out cheerfully.

'True, sir, but his noble arse was left intact-'

Pompey's stool was part of a house clearance. Someone had died and the heirs were selling up so they could divide the cash. On inspection these relics of a departed life were faintly sad: half-used flagons of ink and rolls of untouched papyrus, lidless grain jars still part full of wheat, baskets of old boots, bales of blankets, the bowl they used to feed the watchdog from. There were pans with loose handles and oil-lamps with broken noses. Lazy bidders settled their backsides against couches with chipped legs and shredded material: signs of long wear that an owner stops noticing but which stood out pathetically here.

That said, it had been a middle-class household; to me that hinted of bargains, for the family money was probably recent and the chattels had a modern air. I adopted a casual attitude, while scanning the lots eagerly.

No sign of a bed, of course; the one thing I wanted. I could see some good outdoor stoneware (I had no garden, but in Rome dreams are cheap). The outstanding piece in the sale was a pedestal table with a huge citron-wood top that must have cost thousands; even in the open air on a dull winter's day its grain shimmered lustrously. Geminus had had it polished up with oil and beeswax. I drooled, but moved on to a group of neat bronze tripods of various sizes. One, with lion's feet and a nicely scrolled lip to stop things rolling off the top, involved a fascinating device for adjusting its height. I had my head underneath, trying to work out how to move it, when one of the porters nudged me.

'Don't bother. Your old fellow's slapped a huge reserve on that. He wants it himself.'

Trust him.

I glanced at Pa on his trestle, a short but commanding figure with untidy grey curls and a straight, sneering nose. Those dark eyes of his missed nothing. He must have been watching me for some minutes. Gesturing at the tripod, he gave me a derisive wave to confirm that I would be overbid. For a wild second I would have given anything to get the adjustable tripod-then I remembered that is how auctioneers grow rich.

I moved on.

The heirs were determined to milk their inheritance. A pair of folding wooden doors that probably once graced a dining-room had been lifted off their pivots. The bronze dolphin from a fountain had been wrenched from its plinth, grazing the poor creature's beak. The looters had even cut handsome painted panels from interior walls, shearing them off on thick rectangles of plaster. Geminus would not approve of it. Neither did I.

Other things were not quite right today. Being a born rifler through rubbish, at first the sale goods held my attention and I hardly noticed the people or the atmosphere. Then gradually I began to suspect that I had walked in on a situation.

The auction would have been publicised for a week or so at the Saepta. Big sell-offs attracted a regular core of buyers, most of whom would be known to Geminus. Some I even recognised myself: dealers, plus one or two private collectors. There was little here for real connoisseurs, so those in search of serious art were already drifting off. The dealers were a shabby, peculiar lot, but they were there for a purpose and got on with it. A few passers-by could always be expected to wander in, and the Porticus had its daily quorum of unemployed intellectuals hanging about. Then there were various people looking embarrassed because they were auction novices; they probably included the sellers, trying to check up on Geminus, and curious neighbours of the dead man who had come to pick over his library and sneer at his old clothes.