'What was all that about?' I murmured discreetly.

'Oh…' He stretched his shoulders slowly before he spoke. 'Half a dozen foul-mouthed countrymen in armour-plated helmets looking for some idiot who had stamped on their toes. They pawed our kit and threatened us all until Silvia gave them a piece of her mind-' Sampling Arria Silvia's mind was as tricky as letting a midge fly up your nose. 'I pretended I was just a Roman tourist who had stopped beside the highroad for an argument with his wife-' I wondered what they were arguing about; knowing them, probably me. 'They rattled off towards Capua. The sour green cloak in charge said I was the wrong man anyway…'

'Who did they want then?' I meekly enquired.

'Some stupid bastard called Falco,' Petronius growled.

Late June: everyone who could manage it had left Rome. Some visited their country villas. Most of those who chose the seaside must have arrived two days before us. The crowds gave my predicament more urgency; I wanted to be safely behind doors.

At least I knew where I stood: Barnabas was still skulking about in that horrid viridian cloak. He was here in Campania-and now he was looking for me.

There were plenty of towns and villages around the Bay but we ruled out some, and the rest rejected us. Neapolis itself, with its fine summer palaces, seemed too pretentious to afford, while Puteoli, which had been the main landfall for Rome until the development of Ostia thirty years before, remained a noisy commercial port. Misenum was lousy with officials, being home to the fleet. Baiae, the fashionable watering hole, was commoner but full of dirty lodgings which refused to welcome children. Surrentum straddled a marvellous ravine which had to be reached by sea or miles of winding road; if a demented assassin was pursuing me, Surrentum could form a dangerous trap. Pompeii was too brash, Herculaneum too prim, and the thermal spa at Stabiae chockablock with wheezing old gentlemen and their snooty wives. There were villages on the slopes of Vesuvius, but the children had been promised the sea.

'If one more bare-arsed Campanian landlord shakes his head at our kittens and chamber pots,' Petronius confided in a dangerous undertone, 'I reckon I'll lose my temper unpleasantly!'

'How about Oplontis?' I suggested, trying to assume an air of casual innocence.

Oplontis was a small fishing hamlet in the centre of the Bay where the pervading scent of grilled mullet spoke well of the amenities. It boasted an immensely elegant villa complex, heavily boarded up. The smugglers were drinking peacefully and the beach boys pretending to mend their nets while they stared at us. This looked suitable. It looked cheap. It looked small enough to be safe; if an armed troop clattered in from Herculaneum, a curious crowd would flock out from every cottage on the beach. Oplontis (as it happened) was where I wanted to be.

We found a gap-toothed old biddy in black who hired us two scrappy rooms on the first floor of a faded hostelry. I noticed Petronius working out how if anybody sinister entered the front courtyard we could evacuate his family through the stable at the rear.

No one else was staying there; we could see why.

'We can manage for a night,' Petro tried to convince himself. 'Then find somewhere better for tomorrow-' He knew once we settled in we would be fixed for our whole stay.

'We ought to have stopped in Baiae!' Silvia complained. Even when the rest of their tour party are tired as dogs, other peoples' wives can always find the energy to whine. Larius kept sniffing; he had noticed an intriguing smell. Seaweed, perhaps. Or perhaps not.

'Oh Larius, put a peg on your nose!' I snapped. 'Wait until you sample the public latrines in Stabiae and Pompeian drains!'

There was a courtyard with a well and a thin vine struggling on a pergola. Larius and I had a wash and sat on a bench while Silvia organized the beds. It was obvious she wanted to quarrel with Petro. One of our rooms had a window covered by a hide, allowing Larius and I to overhear the family violence; the phrase 'Nothing but trouble!' cropped up several times: that was me.

Petro's pretty little turtle dove informed him that at first light next morning they would take their children home. His reply was too quiet to catch. When Petro swore he was astonishingly vulgar, but in a savage undertone.

Eventually things grew less intense; then Petro came down. He dashed a bucket of water over his head, hesitated, then joined us on the bench; his need for solitude was evident. He produced a smokey-green glazed flagon, gulping straight from it like a traveller who had driven further than he intended, and put up with a lot of abuse.

'How's the billet?' I ventured, though I guessed.

'Ropey. Four beds and a bucket.'

'Is Silvia upset?'

'It'll blow over.' A faint, tired smile touched Petro's lips. 'We've put the children and Ollia in one room; you two will have to be with us.'

Sleeping our large party on the cheap posed tactical problems: worst for Silvia and him. I offered to take Larius out for an hour; Petro merely grunted irritably.

He pulled again from his flask, which he did not offer round. Being clean again in a quiet place (with a drink) soon mellowed him sufficiently to go onto the attack: 'You ought to have warned me, Falco!'

'Look, I'll find a different dosshouse-'

'No. If some mob-handed bully boy is chasing you, I want you in sight!'

I sighed, but said nothing because his wife came down.

Silvia seemed quieter now. She took a spiteful pride in remaining efficient whatever the crisis, so had carried down a tray of cups. Larius got hold of the flask; I left it alone. I was looking forward to sampling the famous wines of Surrentum and Vesuvius, though certainly not tonight.

'Falco, you ought to have warned us!' Arria Silvia accused me bitterly, as if she really thought Petronius would have omitted saying it.

I sighed. 'Silvia, I have work to do. I'd like to stay unobtrusive in a family group. As soon as I can meet the man I need to interview, I'll be off. Petronius is not involved-'

Silvia snorted. Her voice grew more tense. 'Oh! I know you two! You'll leave me alone with all the children in this terrible village while you do what you like. I won't know where you are, or what you're doing, or what any of it is about. Who,' she demanded, 'were those men this afternoon?' Silvia had an accurate grasp of whatever her male companions were trying to conceal.

I must have been weary. I was beginning to feel I could no longer cope; a typical holiday mood.

'The one in green must be a freedman with a grudge called Barnabas. Don't ask me who loaned him the cavalry. Someone told me he was dead-'

'Ghost, is he?' Petronius rasped.

'Matter of time!' Petro gave me his sardonic smile; I decided to concentrate on Silvia. I poured her a drink; she had a prissy way of sipping wine that made my teeth grate. 'Look, you know I work for Vespasian. A certain group have hung back from welcoming him to the purple; I'm persuading them that that is a bad idea-'

'Persuading?' Silvia interrogated.

'Apparently,' I said drily, 'the new diplomacy consists of reasoned argument-backed up by hefty bribes.'

I was too tired to argue and far too much in awe of her. Silvia reminded me briefly of Helena at her worst, but a tussle over nothing with her ladyship had always given me the mental satisfaction some men find in playing draughts.

'Earned any real cash from Vespasian yet?' Petronius niggled. My reply would have been ill-natured but we were supposed to be here to enjoy ourselves, so I held back. In a scruffy lodging house beside the Bay of Naples you get no thanks for restraint.