Supposing Libycus refused to contemplate killing Aviola, how did Amaranta feel about disposing of Mucia Lucilia? Of course male cynics will tell you women are more bloodthirsty. But she seemed a perfectly decent young woman to me.

You may think I am bound to say that. Not me. I am ready to believe the worst of anyone. I judge by feel and instinct, the informer’s precious tools. My gut said Amaranta was hoping to be freed in the near future, which gave her no motive for murder. Far from it. Her mistress’ sudden death had removed all her hopes. I could not imagine that sharp girl, with the fancy hair plaits and plenty of men hankering, would jeopardise her prospects.

I thought back to the day I interviewed the slaves. When I saw them at the aediles’ office there had been no sign of tensions between them. Even though I had now been told there were ructions in this household, the small group had sat together quietly, dull-eyed and anxious over their fate, but as far as I could tell they were bonded, a single entity. Some – Amaranta, Phaedrus the other porter, Chrysodorus the philosopher, Olympe the girl musician – came from Mucia Lucilia’s previous house; the rest had a long-term service with Aviola. Some had general duties in the house or garden; others carried out more personal services. Some – Amethystus and Diomedes – seemed reconciled to a life of slavery; others were hankering for freedom and perhaps very close to obtaining it. Had they not told me, I would have been unable to distinguish.

Did this mean they were indeed bonded – through joint involvement in the crime?

After mulling until my brain was in turmoil, I left the apartment. I had no wish to stay there that particular night, especially since I had mislaid Dromo. Last night’s violence against Quintus Camillus had made me jumpy.

I ventured out of doors nervously. To my relief, as I scanned the street for anyone from the Rabirius gang, I spotted the foreman Faustus had sent for the search. He was finishing snacks at a bar with his men, so I asked to join them as they made for home. Escorting me to where the Camillus brothers lived hardly took them out of their way to the Aventine.

At the Capena Gate I found that Uncle Quintus was awake, up to a point. He had chosen to dull his pain with a large goblet of Chian red wine. This, he claimed, was a more natural and cheering painkiller than medicine – and anyway the Chian was ready to drink. Lying on multiple pillows, with offspring sprawled around him telling him stories and playing quiet games among themselves, he smelt curiously of turpentine balms when I leaned in to kiss him. He was not making much sense, though seemed easy in himself.