On the next leg of our journey things started to happen.

I was fast losing heart. Visiting the ceramics factory had served as a diversion, though one which produced its own anxieties since I had bought nothing and would be due for a drubbing back at home. Still, I gave no more thought to potters and their problems; I had troubles of my own. My real mission loomed. By Lugdunum we had put a third of the distance across Europe behind us, with the tiring sea trip from Ostia before that. Now we were on the final push, and the nearer we drew to the great Rhenus river, and to the ludicrous tasks Vespasian had set me, the more depressed I felt.

Not for the first time, I had become horrified by how far we had to journey in order to cross Europe, and by how long it was taking.

'More bad news, Xanthus! River travel's too slow. At this rate I'll hit winter before I finish my mission. I'm transferring to horseback, courtesy of my imperial travel pass, so you'll have to hire yourself a mule if you want to keep up.'

Don't imagine that Vespasian had kitted me out with the wherewithal to commandeer a horse from the state despatch stations because he wanted me to travel in comfort; he probably thought it more convenient for the Iron Hand.

The terrain looked decidedly foreign now. Instead of huge Italian villas with absentee landlords and hundreds of slaves, we were riding past modest tenant farms. Pigs instead of sheep. Fewer olive groves and thinner vineyards with every milestone. We were being held up at bridges by army supply convoys; it was definitely the approach to a military zone. Towns became a novelty. Everywhere was colder, wetter and darker than when we had left home.

As a traveller Xanthus was becoming more confident, which meant that as the idiot's nursemaid I had to be even more on guard. Explaining trivial regional habits every time we stopped to change horses was maddening. In addition, it had started to rain.

'I've been slipped some duff coins, Falco-cut in quarters and halves!'

'Sorry, I ought to have warned you: there's a long-term small-coin shortage. No need to show your ignorance by causing a fuss. Cut halves are accepted locally, but don't take any home. Assuming we ever go home.' I was so gloomy I doubted it. 'You'll adapt. Just try not to waste an as or a quadrans if you can pay with one of your larger coins, and pick up change for when we're desperate. If they run out of coppers altogether the barmaids use kisses, and when they run out of those:' I shuddered pointedly.

'Seems daft!' Xanthus moaned. A true barber. Jokes were lost on him.

Sighing inwardly, I supplied the sensible explanation: 'The army has always been paid in silver. Sesterces are easier to transport in bulk, so the Treasury never thinks of sending out a few chests of coppers for the lads to use as pocket money. There is a mint at Lugdunum, but civic pride seems to make them prefer turning out the big shiny ones.'

'I wish they'd cut their prices in half too, Falco.'

'And I wish a lot of things!'

I spoke with restraint, though I was near breaking-point. I wished it would stop raining. I wished I could find Helena. I wished I was safe in my own city, commissioned for a risk-free job. Most of all, as the barber prattled on relentlessly, I wished I could lose him.

We stayed the night in a village typical of that highway: a long skein of ribbon development with one main street devoted mostly to entertaining travellers. There were plenty of rest-houses, and once we found a clean one to dump our baggage at, there were plenty of taverns we could walk to for a change of scene. I chose one of the porticoed bars that was throwing light across the street, and we fumbled our way down into a back basement where other travellers were seated at circular tables enjoying cold meat or cheese with beakers of the local fermented beer. The scent of damp woollen cloaks and sodden boots hung everywhere as we all steamed after the day's wet ride. The bar was warm, dry and lit with reed tapers. It had a we-are-here-to-please-you atmosphere which eased the strain of travelling even in those of us who were reluctant to be eased by anything too much in case Fate made us pay a sour penalty.

We drank. We ate. Xanthus perked up; I said nothing. He called for a drink again; I jingled my purse morosely. I would be paying as usual. Xanthus found plenty of ways to squander his holiday cash, but possessed a knack of digging deep only when I let him out by himself. He had cluttered us up with souvenirs-rattling lanterns, statuettes of muscular local deities, and chariot-wheel talismans-yet somehow funding our supper always seemed to be my responsibility.

This bar was casual about payment: you settled up at the end. It was a good way to part people from more money than they had intended, though in fact when I heaved myself over to sort out the reckoning, the extortion was not too painful, considering how much the barber had eaten and drunk.

A good evening-for a man who could feel free to enjoy it.

I told Xanthus to press on ahead while I waited for the usual scramble among the staff to find coins for my change. When I emerged on the main street my tame pest had already vanished. I was in no hurry to catch up. It was a dry night, with crazy stars dotting a black sky among a few fast, high clouds. Tomorrow we would probably have teeming showers again, but I stood for a while enjoying this fierce, dry wind on my face. The street was empty at that moment. I was suffering a pang of traveller's melancholia.

I turned back into the bar, where I ordered a dish of raisins and another drink.

The room had thinned out. Feeling independent, I changed seats. This allowed me to survey my drinking companions. Men were talking together in small parties; some were dining alone. Two caught my eye because they seemed to be together yet never spoke. There was no impression of a quarrel; they simply looked even more depressed than I had been before I shook off Xanthus.

A barmaid lit a new taper on their table. As it flared, I recognised the pair; they wore high-necked tunics under blackberry-coloured Gallic wraps with pointed hoods. One was overweight and middle-aged; the other had reddish hair and a particularly florid crop of warts on his cheeks and hands. They were the two I had seen at the ceramics factory, arguing.

Had they looked more communicative I might have gone over and mentioned the coincidence. As it was, they were sunk in their thoughts and I was sleepy, enjoying my snatched period of privacy. I finished my raisins. The next time I looked up they were on their way out. Just as well, probably. I doubted if they had noticed me at Lugdunum, and in any case, they had been so angry there that they might not welcome a reminder of the scene. Tomorrow we would all continue our journeys to different destinations. It was highly unlikely another chance meeting would occur. But it did. Well, I saw them.

Next morning, half an hour out of the village, while the barber was still maundering on about where I had disappeared to for so long the previous evening, and I was ignoring the flow of complaint with my usual tight-lipped tact, we came across two tent parties of army recruits. There were no legions stationed in Gaul itself. These goslings must have been waddling towards the frontier. Now they had stopped. They were standing about the highway like spilled carrots, twenty seventeen- and eighteen-year-olds still unused to the weight of their helmets and only just discovering the drear boredom of a long march. Even the centurion in charge of them, who must have been around a bit, was inadequate for the crisis they had stumbled across. He knew he represented law and order, so he knew he had to do something. But he would rather have kept going with his eyes fixed straight ahead. Frankly, so would I.