Uncle Fulvius was staying in. Business must be coming to him tonight. As I went downstairs, I passed a man going up. That was the difference in Egyptian town houses: a classic Roman home has a line of entry straight ahead from the porch, crossing the atrium if there is one. It offers a show-off vista from the street - and a certain degree of space and choice; you can go either way around the peristyle garden, for instance. Here, it was all vertical. Anyone coming or going used the stairs. That could work two ways. With a house full of guests, in the commotion you might manage to infiltrate an extra person unnoticed. But if the house guests were prone to milling about, there was no chance of receiving a secret visitor.

So I not only saw the man, we exchanged nods. I pressed against the wall to give him room. He pulled his satchel in to avoid brushing against me, with his left arm clutched against the leather so I would not hear the money chink. He will have seen a good-looking foreigner, neutral tunic, Roman haircut, clean-shaven, pleasant manner, in command of himself. I saw a thickset trader-type, who did not meet my eye. Sometimes you know instinctively that whatever a man of commerce is selling, you do not want it.

One of Fulvius’ servants was waiting at the top of the stairs to shunt this man into a private side room, probably the same salon where they put Nicanor earlier. Lying below the family rooms, it had a couple of basic couches, a tripod table just large enough for a drinks tray, a rug you could buy anywhere and no ornaments worth stealing. I kept a room just like it in my own house in Rome. I used it for clients and witnesses, allowing them access to my home as a good patron traditionally did for trusted members of the public. I never trusted anyone. If they came out of the room and pretended they wanted to use the lavatory, a slave who always just happened to be in the corridor would ‘show them the way’; he would just as helpfully show them the way back too.

Downstairs, the courtyard porter saluted me obsequiously.

I nodded after the visitor. ‘Who was that?’

‘I know not his name. Fulvius knows?’

‘No doubt . . .’ I had no intention of letting Fulvius see I had any interest. ‘Is the palanquin here?’

‘You want Psaesis? Has gone. Here again tomorrow.’

Typical.

I half hoped the driver who took us to Lake Mareotis would be out in the street, even if he was still muttering with the dogged hanger-on Katutis. They were both missing. It must have been the first time since we arrived that I managed to leave home without being accosted.

I walked to the Museion. It took me back to my early years as an informer, when I had walked everywhere. That was all I could afford then. My legs were older now, but held up.

The wind was still whipping dust everywhere. There were plenty of people on the broad streets. Life in the Mediterranean is lived out of doors, on the pavement or at least on the thresholds of businesses. As I passed leather shops, furniture-makers, coppersmiths, I could see into lit interiors where families hung around. Wafts of grilled and roasted foods were borne on the restive gusts of the Khamseen. Dogs of all sizes enjoyed being part of the street life. So did cats, long lean creatures with pointed ears who were viewed as sacred creatures; I avoided them, lest I be like that Roman who killed a cat on the streets of Alexandria and not unexpectedly was torn to pieces by a mob.

I missed my dog. She was left behind with my mother, but she would have loved sniffing around here. Mind you, taking Nux anywhere near the zoo would have been a nightmare. As for the revered Alexandrian cats, Nux would have added a few to the total of sacred pussies who needed to be mummified.

Thinking about Nux kept me occupied until I reached the Museion complex. Here it was much quieter. The grandiose buildings had a spectral presence after dark. Their long white porticoes were poorly lit by trails of oil lamps at floor level, many of which had gone out. A few men strolled through the gardens, in small groups or alone. There was a sense of activity still carrying on, although real toil had been ended for most of those who lived here.

This must have been the peaceful atmosphere when Theon returned that night after dinner. His subdued steps may have been the only ones. The sound had been unusual enough to make the astronomer glance over from the observatory, though not so rare as to cause Zenon to continue watching once he saw it was just the Librarian. I wondered whether Theon had known or guessed that somebody had noticed him. I wondered if it gave him a sense of fellowship, or increased feelings of isolation. I wondered if he was going to meet someone.

I retraced what must have been Theon’s route. As I walked, I checked for oleander, but none of the bushes that adorned the walkways were of that type. It was our fault, then. Whether suicide or murder, he died because of his dinner garland. Finding out what happened was, therefore, my responsibility.

When I came to the main door of the Great Library, the two enormous portals were securely locked. I turned away. That answered that question. There was bound to be a side door but admission would be monitored, or by special key.

I walked slowly back down the porticoes towards the refectory. I was intending to try to find Aulus. If I was not allowed in, I would ask someone to go and look for him.

There were people about. Sometimes I heard low voices talking, sometimes just a footfall. Once someone passed me and politely said good evening. Once or twice I heard others cross paths and greet each other in the same way. I was alone, however, when the commotion started.

It was coming from the zoo. I heard voices shrieking for help in obvious hysteria. An elephant began trumpeting alarm. Other animals joined in. The human voices had seemed to be both male and female. As I started to run towards them, things changed, so for a few moments there was only a woman, screaming.

And then silence.

XXVIII

I had no weapons. Who goes into a seat of learning armed to the teeth? All you expect to need are knowledge, clarity and the gift of irony.

I managed to pick up a couple of oil lamps; their glimmer hardly lit the shadows and probably drew attention to me. I stood listening. The animals had ceased to trumpet, though I heard restless movements in their various enclosures and cages. Something had definitely disturbed them. They were listening too. They may have had a better idea of what had happened - or what could still happen, but with me doing the shouting - than I did. Like me, the agitated creatures all sounded certain they did not like the situation.

I thought I heard a long rustle, close to me amongst nearby shrubs. I turned, but could see nothing. A purist might say I should have gone in among the foliage to investigate, but believe me, nobody with any imagination would.

I started to explore the deserted paths. Everywhere lay in darkness. My lamps created a tiny circle of gloom. Beyond it, the blackness seemed all the more threatening. Part of the zoo’s benign regime for the animals was to let the precious creatures have their natural amount of sleep. Not tonight, though. As time passed I could still hear them, awake and all apparently watching my progress. Or watching out for something else.

The largest zoo in the world was indeed spectacularly big. Searching took ages. I forced myself to examine each area as best I could, in a hurry, in the dark. Whatever I was looking for, I knew would be obvious once I came across it. Those terrible shrieks had not been tipsy students larking about. Somebody had suffered terribly. Horror was still rippling along these deserted pathways with the wind that hoarded dust into patches like puddles against the raised kerbs. I thought I could smell blood.