I asked more questions of the barman. This time he changed his story; he now remembered he had met the tenant’s brother. His wife had appeared, curious about us. He was short and sparely built; she was shorter and enormous. She had met the brother too. The fond couple engaged in a hot marital argument; the barman maintained the brother was a scruff and a shambles, which the wife doggedly disputed. ‘Kept himself nice. Good threads. Combed his hair.’ They went on disputing, until it almost sounded as if they had seen two different brothers. Given the numbers of Claudii, this was possible.

‘Fancied him?’ asked Aulus, cracking the grimace he used for charm.

‘Not likely—he had funny eyes.’

It was the wife who knew the real reason Virtus came back so regularly. ‘He’s one of Alis’ regulars. He comes every Thursday.’

‘Is Alis the local prostitute?’

‘Not her! Fortune-teller. Just around the corner. She does a bit of witchcraft when people want to pay for it. Thursday is her night for seances. Virtus always went.’

As Petronius could not tear himself away from the room upstairs, I left the Camilli to wait for him. I strolled past a veg stall, a pot shop and a sponge bar, tripped around a corner by a fountain that was so dry its stone had cracked in the sun, and parked myself in a peeling doorway in order to inspect the fortune-teller’s. The place I had been told Alis lived in was anonymous. These women work by word of mouth, usually hoarse whispers passed on in the environs of unscrupulous temples. Anyone who has enough sixth sense to find a horoscope-hatcher, doesn’t need her services.

After waiting a while, I went across and knocked. A frizzy baggage came to the door and admitted me. She was middle-aged and top heavy, wearing peculiar layers of clothes, over which were dried-flower wreaths with funny feathers sticking out of them. I expected a dead mouse to drop out any minute. The prevailing colour of her wardrobe was vermilion. It was amazing how many scarves and belts and under-tunics she had managed to acquire in that far-from-fashionable shade.

She moved with a shuffle and was slow getting around. Only her eyes had that sly, kindly glint you find in folk whose livelihood depends on befriending people with no personality, banking on the possibility that the vulnerable might part with their life savings and have no relatives to ask questions.

‘My name’s Falco.’

‘What do you want, Falco?’

‘You can tell it’s not a love potion or a curse, then?’

‘I can tell what you are, sonny! You won’t fool me into drawing up a lifeline for the Emperor. I practise my ancient arts fully within the law, son. I pay my dues to the vigiles to leave me alone. And I don’t do poisons. Who sent you?’