I nodded, remembering Daisy. Shy and eager to please, she was a very pale, thin child with white-blond hair and red-rimmed eyes who reminded me a little of a skinned rabbit. Hannah had homed in on her during the previous school term, enjoyed her new friend’s admiration and slavish devotion for a few weeks, before Daisy had been found, tied up with her own skipping rope and soaking wet, in the playground toilet block. Hannah, all wide-eyed innocence, had maintained that they’d merely been playing a game of cops and robbers, and Daisy had eagerly backed up this claim, but from then on the school had done everything they could to keep the two girls apart, at the insistence, I was sure, of Daisy’s mother, who glared at me with open hostility whenever we crossed paths in the playground.

After our talk with Hannah’s form teacher we walked back to the car in miserable silence. ‘Oh, Doug,’ I said when I was sitting in the passenger seat.

He looked at me and sighed. ‘I know.’ He reached over and took my hand, and for a second something of the old closeness between us flickered. He opened his mouth to speak but at that moment Toby woke and began to cry.

I glanced at Doug and began to open my door. ‘I’d better sit in the back with him,’ I said. Doug nodded, put the key into the ignition and we drove home without another word.

A few days after the school meeting we sat Hannah down and told her what her punishment would be. It was always hard to discipline her because it was difficult to find anything – any treat or toy – that she was genuinely attached to: she literally didn’t care if I confiscated any of her belongings. The only thing she really liked to do was watch television. So on that occasion we told her there’d be no TV for a week. I don’t think I’ll ever forget the look of fury, of pure venom on her face when we gave her the news.