Laeta then excused himself. We were allowed to put our feet up in his luxurious bolt hole until required.

`This is a right mess, Falco!' Petro tested the flagon but we had already drained it. `I don't want a bunch of amateurs all over my patch.'

`Don't burst your pod. It was you who made yourself out to be a master of criminal intelligence.'

`Hercules Victor! How was I to know a passing thought would be turned into an issue, with secretaries running around like rabbits and a full intersectional conference on major crime being thrown together the same day?'

I grinned at him kindly. `Well, you've learned something useful here: keep your thoughts to yourself!'

Rooting amongst the scroll boxes, I discovered a slim alabastron of red wine that Laeta had already unbunged and half drunk on some previous occasion. We unbunged it again and helped ourselves. I replaced the container just where I had found it, so Laeta would not think we had been prying amongst his personal stuff.

We took it in turns to nod off.

Instinct told us when to rouse ourselves. This we had learned primarily while watching for moustachioed Britons to jump out from broom bushes. In fact, the Britons had never jumped us. But the instinct had proved useful for warning us of bad-tempered centurions who didn't think it was funny if the footsloggers on guard duty happened to lean against a parapet to discuss whether the Greens were having their best season. ever in the chariot races at home. At any event, when Claudius Laeta bustled back to fetch us, we were neither leaning nor dozing, but had washed our hands and faces in a bowl that a flunkey had brought for Laeta's use, then combed our hair like a couple of swanks going to a party, and sat ourselves up like men who could be relied upon.

'Ah there you are…' Laeta gazed around his room nervously, as if he expected to find vandalism. `The old man's gone across to his own quarters. We'll have to make the trip to the Golden House.'

I smiled. `Lucius Petronius and I would welcome a stroll in the fresh air.'

Laeta looked worried a second time, as if he was wondering what we had been up to that could necessitate a breather.

Nero had set out his Golden House across the whole of central Rome. Via a garden that filled the entire valley of the Forum, he had linked the old Palace of the Caesars to a new complex completed for him by masters of architectural innovation and decor. Our conference was held in the new part. I had seen it before. It still made me gasp.

To reach it, we had come down from the Palatine, through the cool, guarded cryptoporticus, and walked across the eastern end of the Forum, past the Vestals' House and the Sweating Fountain, then around the mess that had recently been the Great Lake dominating the country gardens that Nero had created in the bowl of the Palatine and Esquiline hills. The lake was now a gigantic hole where Vespasian had inaugurated his promised amphitheatre. On the Oppian crest beyond it still stood Nero's fantastic palace. It was too opulent for the new Flavian dynasty, who had restrained good taste, yet too costly and too exquisite to pull down. To build another palace when Rome itself lay in ruins would look a worse extravagance than Nero's. So Vespasian and his sons were living here. At least they could blame their mad predecessor.

Claudius Laeta led us through a maze of marble-clad entrance halls and tall, intensely decorated corridors. I think we were in the east wing; the west seemed to be the private quarters. Guards nodded Laeta past, and he found his way with ease. To a stranger, the Golden House was deliberately bewildering. Rooms and passageways succeeded one another in a seemingly random profusion. The eye was dazzled with gilt and the gleam of the finest polished marble; the brain was bemused by twists and turns; the ear was assaulted by the continual music of water in fountains and cascades. Petronius stumbled into me as he tried to stare up at the minutely painted ceilings while Laeta hurried us along. Finally we took a dart to the left, glimpsed an apsidal hall, whipped past another room, and stepped into the famous fabulous octagonal dining room.

In Nero's day people came here for orgies; just our luck to arrive when times had changed and the best we could get was a crime conference.

The room was full of light. There was an open aspect to the south, with a heart-stopping view that we would not be gazing at. There was a theatrical cascade (turned off). There were curtained side rooms in which scenes of revolting debauchery had once occurred (now empty). Above our heads had been the legendary revolving ivory ceiling that had showered gifts down upon lucky diners (dismantled; no presents for us).

Already assembled were Vespasian and his elder son, Titus, seated on thrones. Petronius would like the thrones. He approved of formality. Titus, a younger version of his father but with a jolly hint of chubbiness, gave me a pleasant nod; I showed my teeth politely. Calm administrators were handing them last-minute briefs.

Other officials were just arriving with us. Summoned from their lunches were both the Urban Prefect, who thought he ran the city, and the Prefect of the Vigiles, who really did the work. Each had a fleet of office minions who were shuttled into the side rooms. To speak up for them: (since they kept themselves unencumbered by practical knowledge), the prefects had brought all seven tribunes of the vigiles cohorts, including Rubella, the Fourth Cohort's own top man, to whom Petro was supposed to report any problems before they became public. Rubella had brought a paper cone of sunflower seeds, which he continued to munch surreptitiously. Despite Petro's scorn, I thought he looked pleasingly human.

Present, though not named in the record, was Anacrites the Chief Spy.

`Falco!' His light eyes flickered nervously as he realised that I was alive, and deep in this unexpected enterprise. He did not ask how I had enjoyed his Eastern fiasco. When I was ready I would report to Vespasian personally, and my comments would be unrestrained by loyalty to the man who sent me there.

`Excuse me,' I answered coldly. `I'm presenting a report…'

Claudius Laeta must have overheard, for he waved Petro and me up close to him; his position was nearest the Emperor. On Vespasian's behalf he was chairing the meeting. What was said is, of course, confidential. The minutes ran to half a closely written scroll. In confidence, of course, what happened was:

The regular officials conducted business briskly. They were held up sometimes by tribunes holding forth on personal theories that had nothing to do with the issue and were sometimes incomprehensible (unminuted). Once or twice a prefect ventured a trite remark (paraphrased succinctly by the secretary). Petronius Longus gave a clear account of his belief that with the removal of Balbinus some new crime lord had seized the initiative. (This, pretty well verbatim, took up most of the record.) Petro had moved in the course of that morning from a man who was talking his way out of trouble to one who looked a contender for a laurel crown. He took it well. Petronius had the right sceptical attitude.

I found myself being consulted by Vespasian as his expert on life in the streets; I managed to produce some ideas that had a ring of good sense, though I forsaw problems explaining later to Helena Justina exactly what I had said.

Anacrites was suddenly asked by Titus what his professional intelligence team had noticed. He offered nothing but waffle. His team was useless, unaware of pretty well everything that went on in Rome. The Urban Prefect gleefully stepped in and pretended his spies had spotted worrying signs of unrest. Asked to be more specific, he was soon floundering.