Helena Justina had decided she would co-ordinate our efforts. Sedina helped look after Julia, in the periods when she had put Petronius down for nap. That left Helena free

to organise Frontinus and me, a task she set about with glee.

She drew up a map of the whole district, plotting who lived where, and whether they should go on our list of suspects. For various reasons, the list ended up shorter than it might have been.

`Since the aqueduct killer has apparently been at his grisly trade for a long time, we can omit anyone with recently acquired property,' Helena reminded us. `Since he kills so repeatedly, we can probably ignore all the large villas which are occupied only on a very irregular basis. Their owners don't come here often enough. We are looking for something extremely, specific: a family who use Tibur not just as a relaxing resort where they may or may not – be staying at given times of year, and from which they may -, or just as easily may not return to Rome for major festivals. Your search is for people who routinely visit all the Games, and who have done so assiduously for decades. If they own a house with access to the river, so much the better.'

Obtaining this information was normally not difficult. If Frontinus found any property-owners at home he asked them outright about their habits and movements. People responded well. Assisting an official tribunal is a public duty with penalties for default. My approach was more subtle, but worked equally well; I invited folk to gossip about their neighbours. I found plenty of material.

`You both learned a lot,' Helena said, sitting us down for a conference after a day's hard work. Frontinus had been brought down to the farm; he was not at all shy of visiting a set of huts in a nettle patch.- Helena grumbled at him just as much as at me: `The trouble is, your work. has not thrown up many likely suspects.'

`Are we going wrong?' Frontinus asked meekly.

`Don't let her bully you,' I grinned.

She looked upset. `Am I being bossy, Marcus?'

`You are being yourself, dear heart.'

`I don't want to behave immodestly.'

`Cobnuts, Helena! You can see the Consul and I are listening like woolly lambs. Tell us the score.'

`Well look,' this is a typical example: Julius Frontinus interviewed a family called the Luculli. They have a, large house near the cascade, with a sublime aspect towards the Temple of the Sibyl '

`They are staying here at the moment, and readily admit that they all went to Rome together for several days of the last Games,' Frontinus reported, still looking slightly nervous of Helena's enthusiasm.

`Yes, but, sir -' That `sir' was a sop to his vanity; he took it well. `The Luculli are a family who have been loaded with money for three or four generations. As a result, they have bought themselves villas in all the fashionable resorts. They have two on the Bay of Neapolis – facing each other from Cumae and Surrentum plus. their yachting base on the Alban Lake, their northern estate at Clusium, their southern one at Velia, and in, this area they not only own the house in Tibur, where we found them, but another: at Tusculum and yet a third at Praeneste – which it turns out is really their old-fashioned favourite when seeking cooler air to escape to from the heat of summer in Rome.'

Frontinus looked thoroughly quashed.

I rubbed it in cheerfully. `So the chances of the lucky Luculli following a regular pattern are zero.'

`Quite,' said Helena. `They are always on the move. Even if they regularly visit Rome for festivals, half the time they aren't staying here. The person you want. kidnaps his victims, then apparently always disposes of them in exactly the same way, and presumably in the same place.'

`So have we come up with anybody suitable?' I asked.

`No.' Helena looked despondent. `Very few fit that category. I thought we had one a Roman, living here for twenty years, goes to Rome for all the major festivals but it's a woman: Aurelia Maesia. She has a villa near the Sanctuary of Hercules Victor.'

`I remember her.' Frontinus had done: the interview.' `A widow. Decent background. Never remarried. Came home to a family estate after her husband died, but now goes into Rome to stay with her sister whenever there is a major event to patronise. She is well over fifty -'His tone hinted that that was a gallant estimate. `She was suspicious of our enquiry,

but surely incapable of murder. Besides, she stops in Rome throughout the Games. Our killer seized Asinia after the opening ceremony, then put at least one of her hands into the water supply very soon afterwards. That means if Bolanus really has found where he does it and it's up here, the man must have returned to Tibur virtually the next day.'

`That's another knot in the pattern,' I warned. `The killer goes to Rome for festivals – yet evidently he comes back after the opening ceremony. But he doesn't stay here. He must go back to Rome a second time, because the torsos and heads are then dumped in the river and the Great Sewer. It's rather distinct behaviour.' An obvious explanation struck me. 'Aurelia Maesia must have litter-bearers, or a driver. Does her litter drop her at her sister's in Rome, return here, and then fetch her at the end of the Games?'

`She uses a driver.' Frontinus was touchingly keen to show off. `I remembered to ask her. She travels in a carriage, but the driver stays with it at a stables just outside Rome. She likes it to be available in case she and her sister want a country drive.'

Aurelia Maesia was no good then, but at least we had found one person who came near to fitting our profile. It encouraged us to believe there could be others somewhere.

`Don't be disheartened,' I said to Frontinus. `The more folk we rule out, the easier it will be to spot who we want.'

He agreed, yet threw in a different problem. `If our man Bolanus is right that the dismembered body parts are entering the aqueducts at source then Tibur itself isn't the place to be.'

`Tibur is supplied from the Aqua Marcia,' said Helena, `but that's an incoming branch which ends here. The main conduit that goes to Rome starts miles away.'

'Halfway to Sublaqueum,' I added, not to be outdone with supplying facts. 'Only another thirty miles of territory where we have to identify every house and farm, then ask the owners nicely if they happen to be murderers!'

FORTY NINE

By arrangement Bolanus reported to Frontinus the next day. I met them both at the house where Frontinus was staying. Bolanus was wearing the same ancient tunic and belt he had had on when I first met him, to which he had added a brimmed hat to guard against the weather and a knapsack for travelling. His plan was to drag Frontinus and me all the way to Sublaqueum, for reasons which I suspected had more to do with a wish to see the dam on which he had once worked than our search. But as a public servant he knew very well how to make a pleasant site visit sound like a logistical necessity.

Frontinus had sent a message to ask Petro if he wanted to be driven to the villa to help us take stock, but my partner refused quite shamelessly. `No thanks. Tell his honour I'd

rather laze about here counting geese.'

`Flirting with the neighbour's kitchen maid, you mean,' I growled.

`Certainly not!' he exclaimed, with a grin. I was right. He had spotted that she was plump in all the right places, eighteen years old, and, given to looking over our boundary fence in the yearning hope that something masculine would glide up for a chat. I myself had only noticed the girl because I had had a perfectly- sensible conversation with Helena Justina about the meagre amount of herb-plucking and, goat. milking that the little madam was given to do. Helena took the view that she was trouble, while I feebly tried to argue that unseemly habits don't inevitably end in tragedy.