It was just that nobody asked the question so he never gave the answer.

During the nineties he started hearing news reports about crimes being solved through DNA evidence, and he wondered if he’d left a miniscule vestige of himself behind: a single hair, for example. But even if he had, they’d been together for such a short time and they’d played their undercover game so effectively. He would never be asked to give a DNA sample because nobody knew he had known Janie. He could almost convince himself that he hadn’t known her, that it had never happened.

And then the years had just gone by, layers and layers of years piled on top of the memory of what he’d done. Sometimes, he whispered, he could go for months feeling relatively normal, and then other times he could think of nothing else except what he’d done and he was sure he’d go crazy.

‘It’s like a monster trapped in my mind,’ he rasped. ‘And sometimes it gets free and goes rampaging about, and then I get it under control again. I chain it up. You know what I mean?’

No, thought Cecilia. No, actually, I don’t.

‘And then I met you,’ said John-Paul. ‘And I sensed something about you. A deep-down goodness. I fell in love with your goodness. It was like looking at a beautiful lake. It was like you were somehow purifying me.’

Cecilia was appalled. I’m not good, she thought. I smoked marijuana once! We used to get drunk together! I thought you fell in love with my figure, my sparkling company, my sense of humour, not my goodness, for God’s sake!

He kept talking, seemingly desperate for her to know every tiny detail.

When Isabel was born and he became a parent he suddenly had a new and terrible understanding of exactly what he’d done to Rachel and Ed Crowley.

‘When we were living on Bell Avenue, I used to drive by Janie’s father walking his dog on my way to work,’ he said. ‘And his face . . . it looked . . . I don’t know how to describe it. Like he was in such terrible physical pain that he should have been rolling about on the floor, except he wasn’t, he was walking the dog. And I’d think, I did that to him. I’m responsible for that pain. I tried to leave the house at different times, or drive different ways, but I kept seeing him.’

They’d lived in the house on Bell Avenue when Isabel was a baby. Cecilia’s memories of Bell Avenue smelled of baby shampoo and nappy cream and mashed pear and banana. She and John-Paul had been besotted by their new baby. Sometimes he’d go in late to work so he could spend longer lying on the bed with Isabel in her little white Bonds suit, nuzzling her plump, firm tummy. Except that wasn’t true. He was trying to avoid seeing the father of the girl he’d murdered.

‘I’d see Ed Crowley and I’d think, That’s it, I’ve got to confess,’ he said. ‘But then I’d think about you and the baby. How could I do that to you? How could I tell you? How could I leave you to bring up a baby on your own? I thought about us leaving Sydney. But I knew you wouldn’t want to leave your parents, and anyway it felt wrong. It felt like running away. I had to stay here where at any moment I could run into Janie’s parents and know what I’d done. I had to suffer. So that’s when I had an idea. I had to find new ways to punish myself, to suffer without making anyone else suffer. I had to do penance.’

If anything gave him too much pleasure – pleasure that was solely for him – then he gave it up. That was why he gave up rowing. He loved it, so he had to stop because Janie never got to row. He sold his beloved Alfa Romeo because Janie never got to drive a car.

He devoted himself to the community, as if a judge had ordered him to do so many hours of community service.

Cecilia had thought he was ‘community-minded’. She’d thought that was something they had in common, when in fact the John-Paul she thought she knew didn’t even exist. He was a fabrication. His whole life was an act: an act for God’s benefit, to let him off the hook.

He said the community service thing was tricky, because what about when he enjoyed it? For example, he loved being a volunteer bushfire fighter – the camaraderie, the jokes, the adrenaline – so did his enjoyment outweigh his contribution to the community? He was always calculating, wondering what else God would expect of him, how much more he would have to pay. Of course he knew that none of it was enough, and that he would probably go to hell when he died. He’s serious, thought Cecilia. He really believes he’s going to hell, as if hell is an actual physical place, not an abstract idea. He was referring to God in a chillingly familiar way. They weren’t that type of Catholics. They were Catholics, sure, they went to church, but heavens above, they weren’t religious. God didn’t come into their day-to-day conversation.

Except, of course, this wasn’t a day-to-day conversation.

He kept talking. It was endless. Cecilia thought of that urban myth about an exotic worm that lived in your body, and the only cure was to starve yourself and then place a hot dinner in front of your mouth, and wait for the worm to smell the food and slowly uncoil itself, sliding its way up your throat. John-Paul’s voice was like that worm: an endless length of horror slipping from his mouth.

He told her that as the girls grew older his guilt and regret were becoming almost unendurable. The nightmares, the migraines, the bouts of depression that he tried so hard to hide from her were all because of what he’d done.

‘Earlier this year Isabel started to remind me of Janie,’ said John-Paul. ‘Something about the way she was wearing her hair. I kept staring at her. It was terrible. I kept imagining someone hurting Isabel, the way I . . . the way I hurt Janie. An innocent little girl. I felt like I had to put myself through the grief that I put her parents through. I had to imagine her dead. I’ve been crying. In the shower. In the car. Sobbing.’

‘Esther saw you crying before you went to Chicago,’ said Cecilia. ‘In the shower.’

‘Did she?’ John-Paul blinked.

For a moment there was beautiful silence as he digested this.

Okay, thought Cecilia, we’re done. He’s stopped talking. Thank God. She felt a physical and mental exhaustion she hadn’t experienced since she’d been through labour.

‘I gave up sex,’ said John-Paul.

For God’s sake.

He wanted her to know that last November he was trying to think of new ways to punish himself and he decided to give up sex for six months. He was ashamed that he’d never thought of it before. It was one of the great pleasures of his life. It had nearly killed him. He’d been worried she might think he was having an affair, because obviously he couldn’t tell her the real reason.