‘The school was definitely the primary scene, yeah? He wasn’t dumped there after he died?’

‘Nah. The blow split his head right open, shitloads of blood. The way it flowed, the Tech Bureau worked out he stayed still after he was hit. No dump job, no trying to crawl for help, he didn’t even reach up and touch the wound – no blood on his hands. Just bang’ – she snapped her fingers – ‘and down he went.’

I said, ‘I’m betting Selena Wynne said she’d had no plans to meet him that night.’

‘Oh, yeah. The three mates said the same. Selena wasn’t meeting him, she wasn’t going out with him, she only knew him from around. Shocked, they were, that I’d suggest anything like that.’ A dry edge on Conway’s voice. Not convinced.

‘What did Chris Harper’s mates say?’

Snort. ‘“Urgh, dunno,” mostly. Sixteen-year-old boys, you’d get more sense going down the zoo and interviewing the chimp cage. There was one that could make sentences – Finn Carroll – but it’s not like he had much to tell us. They’re not staying up all night having heart-to-hearts, the way the girls are. They said yeah, Chris fancied Selena, but he fancied a lot of girls, and a lot of girls fancied him. As far as the guys knew, him and Selena never went further than that.’

‘Anything to contradict that? Contact on their phones, on Facebook?’

Conway shook her head. ‘No calls or texts between them, nothing on Facebook. These kids all have Facebook accounts, but the boarders mostly only use them during the holidays; both the schools block social networking sites on their computers, don’t allow smartphones. God forbid little Philippa runs off with some internet pervert she met on school time. Or even worse, little Philip. Imagine the lawsuit.’

‘So it’s just Joanne Heffernan’s evidence.’

‘Heffernan didn’t have evidence. All she had was “And then I saw him look at her, and then I saw her look at him, and then he said something to her this other time, so they were definitely shagging.” Her mates all swore they thought the same, but they would. She’s a poison bitch, Heffernan is. Her gang, they’re the cool crowd, and she’s the queen bee. The rest are petrified of her. Any of them blink without her say-so, they’ll be out in the cold, taking nonstop shit from her and the posse till they leave school. They say what they’re told.’

I said, ‘Holly and her lot. Cool crowd or not?’

Conway watched another red light and tapped two fingers on the steering wheel, in time to her blinker. ‘Odd crowd,’ she said, in the end. ‘Not the boss bitches; not part of Heffernan’s gang. But I wouldn’t say Heffernan gives them any hassle, either. She dropped Selena in the shit when she got the chance, nearly wet her knickers with the thrill, but she wouldn’t take them on face to face. They’re not the top of the totem pole, but they’re high enough.’