Eventually he gave up. The minute he left, she pulled on a warm cloak, called up a carrying chair, and rushed off to confront her brother at their late uncle's empty, elegant house by the Capena Gate. I did not bother to go with her. I doubted she would find Justinus there. He had enough sense not to place himself in a losing position, like a doomed counter on a backgammon board, right where furious female relatives could jump on him.

My darling wife and mother of my children was a tall, serious, sometimes obstinate young woman. She described herself as 'a quiet girl', at which I openly guffawed. Still, I had heard her describe me to strangers as talented and of fine character, so Helena had good judgement. More sensitive than her outward calm revealed, she was so upset about her brother she failed to notice that a messenger from the imperial Palace had come for me. If she had realised, she would have been even more jumpy. It was the usual washed-out slave. He was underdeveloped and rickety; he looked as if he had stopped growing when he hit his teens, though he was older than that – had to be, to become a trusty who was sent out alone on the streets with messages. He wore a crumpled loose-weave tunic, bit his dirty nails, hung his lousy head, and in the customary manner, claimed to know nothing about his errand. I played along. 'So what does Laeta want?' 'Not allowed to say.' 'Then you admit it is Claudius Laeta who sent you to get me?' Out-manoeuvred, he cursed himself 'fair do's, Falco… He's got a job for you.'

'Will I like it? – Don't bother answering.' I never liked anything from the Palace. 'I'll fetch my cloak.'

We buffeted our way through the Forum. It was packed with miserable householders, taking home green boughs for decoration, depressed by the inflationary Saturnalia prices and by knowing they were stuck with a week when they were supposed to forget grudges and quarrels. Four times I rebuffed hard-faced women selling wax candles from trays. Drunks were already littering the temple steps, celebrating in advance. We had nearly two weeks to get through yet. I had worked on imperial missions before, usually abroad. These jobs were always terrible and complicated by ruthless scheming among the Emperor's ambitious bureaucrats. Half the time their dangerous in-fighting threatened to ruin my efforts and get me killed.