‘Then I could never say the right thing. Everything upset him. It got to the point where I just . . . I was scared to talk. When I got pregnant with Florence I thought he’d be happy. That we’d be a family. But it changed nothing. He only showed interest in her when other people were around. Perfect husband. Perfect father. He’d perform when he needed to and the minute we were alone . . .’ Her voice broke and she went quiet.

‘Did your friends not notice what was going on?’

Arthur tired of his toy phone and crawled round the sitting room, looking for something new to play with.

‘Frederick encouraged me to lose touch with my friends. One by one he took issue with something they had said. Anger that one of their husbands had made a joke about his new haircut. Disgust that one of my school friends put on a lot of weight. There was always something. By the time Arthur was six months old everyone had given up on me. People thought it was what happened when you have kids. You just disappear for a while. Frederick wouldn’t even let me have my phone when he was with me. He’d take it off me the minute he got home from work and hand it back to me in the morning as he left.’

She watched Arthur as he pulled DVDs off the shelf under the television.

‘Did Frederick use your phone when he had it?’

Camilla nodded. ‘Sometimes there’d be what looked like encrypted text messages on it. And there was some app he downloaded. Password protected so I could never get into it. I just presumed it was some kind of spyware – so he could see what I was doing on my phone when he was at work.’

I thought of the Ghosts raiding the warehouse at the first WAF coffee morning to wipe the women’s phones. The WhatsApp worm I sent to our group would’ve downloaded Camilla’s phone too. Frederick must have been using it to communicate with Tenebris. It didn’t matter if he’d deleted anything incriminating, the worm and Geraint would’ve eventually found them.

‘I’m so sorry, Camilla. It’s been horrible for you. You must be so lonely.’