‘So you think Dad came home from work one day with a kid and said, “Look what I’ve found, he’s ours now”? And Mum didn’t bat an eyelid? That’s ridiculous.’ ‘I don’t know what happened. But if you are William Brown, then Debbie was complicit in a crime. And if that’s the case, it’s also feasible that she could know more about Dave’s killings than she’s letting on.’

