He nodded. ‘That’s exactly what I thought at the time. That it was the start of some kind of… I don’t know… extortion.’

‘Extortion?’

‘My lawyer’s word. I went to see him. He took a copy and told me to wait for the next approach. He said that clearly she was building up to a demand for money and we should be ready with a plan. I was in the papers a bit in those days and I’d already had some luck. It seemed likely that she’d suddenly understood her baby’s father was rich, and so now might be the moment for a killing. My offspring would have been about twenty then-’

‘Nineteen,’ I said. ‘Her life was a living lie for nineteen years.’

He looked puzzled for a moment, then he nodded. ‘Nineteen and just starting out. Cash would have come in very useful.’ He looked at me. I didn’t have anything to add since, like the lawyer, I thought this all made sense. ‘I would have given her something.’ He was quite defensive. ‘I was perfectly prepared to.’

‘But she didn’t write again.’

‘No.’

‘Perhaps she died.’

‘Perhaps. Although it seems rather melodramatic. Perhaps, as you say, the letter got posted by accident. Anyway, we heard nothing more and gradually the thing drifted away.’

‘So why are we discussing it now?’

He did not answer me immediately. Instead, he stood up and crossed to the chimneypiece. A log had rolled forward on to the hearth and he took up the tools to rectify it, doing so with a kind of deadly intensity. ‘The thing is,’ he said at last, speaking into the flames but presumably addressing me, ‘I want to find the child.’

There didn’t seem to be any logic in this. If he’d wanted to ‘do the right thing,’ why hadn’t he done it eighteen years before, when there might have been some point? ‘Isn’t it a bit late?’ I asked. ‘It wouldn’t have been easy to play dad when she wrote the letter; but by now the “child” is a man or woman in their late thirties. They are what they are, and it’s far too late to help shape them now.’