He dipped into the letters in a disorganized, irrational way. He’d read them in order later, but now he wanted a flavour of what Hattie had to say. The first few he came to had been written from a psychiatric hospital. They were short, rather incoherent, written on cheap lined paper, and the handwriting was quite different from the rest of the scripts – sprawling, the words slanting away from the lines. At first it was clear Hattie resented being there. Please, please let me come home. I really don’t need this. I can’t stand it. I want it all to end. Was this the reference Sandy had mentioned to her wishing she were dead? Later in her stay as an in-patient they became more chatty. We all went to the swimming pool in town today. I haven’t been swimming in ages and enjoyed it a lot. The minibus broke down on the way back to the unit. We had to walk back and Mark led us like a bunch of schoolkids along the main road. I almost expected him to tell us to get into pairs and hold hands. As her mood improved her handwriting changed, became tidier, more controlled.

There was a gap of two weeks. Perez assumed that she’d moved home before her return to university and there was no need to write to her mother then. He wondered how they’d got on. He wished he’d had the opportunity to meet Gwen James, so he could picture the household more clearly. Had there been long meaningful talks every evening? Or had both women found it easier to pretend that nothing much had happened in Hattie’s life, that the girl’s absence from home had been perfectly normal, like a holiday job or a trip away? Had Gwen continued to lose herself in her work?

Perez went right back to Hattie’s first few weeks at university, before the breakdown and the hospital admission. The paper was plain A4, but the letters were handwritten, not printed from a PC. She never missed the weekly letter. Perez was surprised by the discipline: most students surely led disorganized lives, they went to parties, gigs, had hangovers and last-minute essays to complete. But perhaps Hattie’s life at university was unusually ordered. It was clear that she was ambitious and determined to do well academically. The university letters were mostly about her work. If she had any social life she didn’t tell her mother about it. He read each one carefully, looking for references to friends who might be contacted for information about Hattie’s state of mind, but those who were mentioned were talked of in passing as colleagues. It seemed unlikely that Hattie had kept in touch with any of them.