The other main possibility was the one that Shay and Jackie, on their different levels of charm, had gone for. Someone had intercepted Rosie, either on her way to Theory One or on her way to meet me.

I had a truce with Theory One. Over more than half my life it had worn itself a nice little corner in my mind, like a bullet lodged too deep to dig out; I didn’t feel the sharp edges, mostly, as long as I didn’t touch. Theory Two blew my mind wide open.

It was Saturday evening, just over a day before Zero Hour, the last time I saw Rosie Daly. I was heading out to work. I had this mate called Wiggy who was the night guard in a car park, and he had this mate called Stevo who was a bouncer in a nightclub; when Stevo wanted a night off, Wiggy did his job, I did Wiggy’s, everyone got paid in cash and everyone went away happy.

Rosie was leaning on the railings of Number 4 with Imelda Tierney and Mandy Cullen, in a sweet giggly bubble of flowery smells and big hair and glittery lip gloss, waiting for Julie Nolan to come down. It was a cold evening, fog blurring the air; Rosie had her hands pulled up into her sleeves and was blowing on them, Imelda was jigging up and down to keep warm. Three little kids were swinging off the lamppost at the top of the road, “Tainted Love” was blaring out of Julie’s window and the air had that Saturday-night charge, a fizzle and musk like cider, tantalizing. “There’s Francis Mackey,” Mandy said to the air, nudging the other two in the ribs. “The hair on him. He thinks he’s only gorgeous, doesn’t he?”

“Howyis, girls,” I said, grinning at them.

Mandy was little and dark, with a puff of fringe and a lot of stone-washed denim. She ignored me. “If he was ice cream he’d lick himself to death,” she told the others.

“I’d rather someone else did it for me,” I said, wiggling my eyebrows. The three of them screamed.

“Come here, Frankie,” Imelda called, flipping her perm. “Mandy wants to know—”

Mandy shrieked and dived to clap a hand over Imelda’s mouth. Imelda ducked away. “Mandy said to ask you—”

“Shut up, you!”

Rosie was laughing. Imelda caught Mandy’s hands and held them away. “She said to ask if your brother fancies going to the pictures and not watching the film.”

She and Rosie dissolved into giggles. Mandy clapped her hands over her face. “Imelda, you wagon! I’m scarlet!”

“So you should be,” I told her. “Cradle robbing. He’s only started shaving, do you know that?”

Rosie was doubled over. “Not him! Not Kevin!”

“She means Shay!” Imelda gasped. “Would Shay fancy going to the—” She was laughing too hard to finish. Mandy squeaked and dived back behind her hands.