'Cheer up!' I cried, as I sprang aboard with a lithe twist of the torso and a charming grin. 'It won't happen!'

She continued to scowl bleakly. 'Drop the antique routine, Falco.'

'Sorry. The old lines are the best – '

'Diana of the Ephesians! Put a lid on it, poser.' I was about to think, This never happens to Philocrates, when I remembered that it had.

She was twenty, perhaps less. She had probably been on the stage for eight or nine years; it's one of those professions where girls with looks start young. In a different social circle she would have been old enough to become a vestal. There can't be much difference between being a priestess and an actress, except for public status. They both involve fooling an audience with a ritual performance in order to make the public believe in the unbelievable.

I did my best to be professional, but Byrria's looks were impossible to ignore. She had a triangular face with green eyes like an Egyptian cat set wide above high cheekbones and a thin, perfect nose. Her mouth had a strange lopsided quirk that gave her an ironic, world-weary air. Her figure was as watchable as her face, small and curvaceous, and hinting of unrevealed possibilities. To finish the business, she had a dramatic knack of looping up her warm brown hair with a couple of bronze hairpins, so it not only looked unusual but stayed in place, showing off a tantalising neck.

Her voice seemed too low for such a neat person; it had a huskiness that was completely distracting when combined with her experienced manner. Byrria gave the impression she was holding all the competition at arm's length while she waited for the right person to move in on her. Even though he knew it was a false impression, any man she met would have to try.

'Why the hatred of men, flower?'

'I've known some, that's why.'

'Anyone in particular?'

'Men are never particular.'

'I meant, anyone special?'

'Special? I thought we were talking about men!'

I can recognize an impasse. Folding my arms, I sat in silence.

In those days the road to Gerasa was a poor one, begging for a military highway to be thrust through to Damascus. It would be done. Rome had spent a great deal of money on this region during the Judaean troubles, so inevitably in peacetime we would be spending even more. Once the region settled down the Decapolis would be dragged up to decent Roman standards. In the meantime we were suffering on an old Nabataean caravan route that nobody maintained. It was a lonely landscape. Later we reached a level plain and crossed a tributary of the Jordan through more fertile pasture into thick pine forest. But this early stage of our trip involved a rocky track amongst scrubby hills with only occasional glimpses of low nomad tents, few of them with visible occupants. Driving was not easy; Byrria had to concentrate.

As I expected, after a short time the lady felt obliged to fire more arrows at me. 'I have a question, Falco. When do you intend to stop slandering me?'

'Goodness, I thought you were about to ask for the address of my cloak-maker or my recipe for tarragon marinade! I know nothing about any slander.'

'You're making out to everyone that Heliodorus died because of me.'

'I never said that.' It was only one possibility. So far it seemed the most likely explanation for the playwright's drowning, but until I had proof I kept an open mind.

'I had nothing to do with it, Falco.'

'I do know you didn't push him into the cistern and hold his head under. A man did that.'

'Then why keep hinting I was involved?'

'I wasn't aware that I had. But face facts: like it or not, you're a popular girl. Everyone keeps telling me Heliodorus was after you but you weren't having it. Maybe one of your friends tackled him. Maybe it was a secret admirer. It's always possible someone knew you would be pleased if the bastard was out of the way, and tried to help.'

'That's a horrible suggestion!' She was frowning bitterly. On Byrria a frown looked good.

I was starting to feel protective. I wanted to prove the murder was nothing to do with her. I wanted to find a different motive. Those wonderful eyes were working impossible magic. I told myself I was too professional to let a dainty little actress with a pretty set of wide-spaced peepers overcome me – then I told myself not to be such a fool. I was stuck, just as anyone would be. We all hate murderers to be beautiful. Before long if I did unearth evidence implicating Byrria as an accomplice I would find myself considering whether to bury it in an old hay sack at the bottom of a drainage ditch:

'All right, just tell me about Heliodorus.' My voice was rasping; I cleared my throat. 'I know he was obsessed with you.'

'Wrong.' She spoke very quietly. 'He was just obsessed with getting what he wanted.'

'Ah! Too pushy?'

'That's a man's way of putting it!' Now she sounded bitter, her voice rising.' " A bit too pushy" almost makes it sound as though it was my fault he went away disappointed.'

She was staring ahead, even though the road was easier to travel at this point. Away to our right a teenaged girl watched over a small flock of lean brown goats. In another direction vultures wheeled gracefully. We had started out early on purpose; now the heat was beginning to reflect off the stony track with dazzling force.

Byrria was not intending to help me. I pressed for more details: 'Heliodorus tried it on, and you rebuffed him?'

'Correct.'

'Then what?'

'What do you think?' Her voice remained dangerously level. 'He assumed that saying "No" meant "Yes, please -with force".'

'He raped you?'

She was a person who showed anger by very carefully keeping her temper. For a moment, while I reeled at this new angle, she also stayed silent. Then she attacked me contemptuously: 'I suppose you're going to tell me that there is always provocation, that women always want it, that rape never happens.'

'It happens.'

We were raging at one another. I suppose I knew why. Understanding it did not help.

'It happens,' I repeated. 'And I don't just mean men attacking women, be it strangers or acquaintances. I mean husbands misusing their wives. Fathers having "special secrets" with their children. Masters treating their slaves like so much bought meat. Guards torturing their prisoners. Soldiers bullying new recruits. High officials blackmailing – '

'Oh be quiet!' There was no mollifying her. Her green eyes flashed and she tossed her head so the ringlets danced, but there was nothing charming in the gesture. Undoubtedly enjoying the fact that she had misled me, she exclaimed, 'It did not happen to me, in fact. He had me on the ground, he had my wrists pinioned above my head and my skirts up, and the bruises he made forcing his knee between my thighs were still showing a month later, but somebody came looking for him and rescued me.'

'I'm glad.' I meant it, even though something in the way she had forced me to hear the details was subtly disturbing. 'Who was the useful friend?'

'Mind your own business.'

'Maybe it matters.' I wanted to force her to say it. Instinct told me I ought to identify her rescuer. She knew something I wanted to hear, and I could easily have become as much of a bully as Heliodorus.

'What matters to me,' Byrria flared angrily, 'is that I thought Heliodorus was going to rape me. Afterwards I was living with the knowledge that if he ever caught me on my own he was bound to try again – but all you need to know is that I never, ever went near him. I tried to know where he was always, because I made certain that I kept as far away from him as possible.'

'You can help me then,' I said, ignoring her hysterical edge. 'Did you know he was going up the mountain that last day at Petra? Did you see who went with him?'

'You mean, do I know who killed him?' The girl was effortlessly bright – and deliberately made me feel like an idiot. 'No. I just noticed the playwright was missing when the rest of us gathered at the theatre ready to leave.'