“Has something happened to Louisa?” he asked again. “Is that why you’re here? Are you a policeman?”

“Nothing’s happened to her as far as I know,” said Banks. “And no, I’m not a policeman. I’m looking for her.”

He frowned. “Looking for Louisa? Why? I don’t follow.”

“I’m her father.” The lies were starting to come rather more easily now, after just a little practice, and Banks wasn’t sure how he felt about that. Something to do with the end justifying the means crossed his mind and made him feel even more uneasy. Still, it wasn’t as if he hadn’t told plenty of lies in the course of his work, so why worry about it now he was doing the same thing as a private citizen? All in a good cause, if it could help a teenage runaway get herself sorted and get Jimmy Riddle off his back for good.

Craig raised his eyebrows. “Her father…?” Then he seemed suddenly to notice the developing tank he was shaking. “Shit. Look, I’ve got to finish this off properly or it’s a week’s work down the tubes. Come up if you like.”

Banks followed him upstairs, where Craig had turned his spare room into a makeshift darkroom. He didn’t need complete darkness for this stage of the process, so a dim light glowed on the wall. With expert, economic gestures, Craig emptied the tank of developer, poured in the stop bath and shook the tank again for a while. After that, he emptied it out again and poured in the fixer.

Banks noticed a number of photographs of Emily Riddle tacked to a corkboard. Not nude shots, but professional-looking folio stuff. In some she wore a strapless black evening gown and had her hair pinned up. In another she was wearing a vest and baggy jeans, showing her bare midriff with its spider tattoo, trying to look like Kate Moss or Amber Valletta.

“These are good,” he said to Craig.

Craig glanced over at them. “She could be a model,” he said sadly. “She’s a natural.”

The harsh chemical smells transported Banks back not to his life with Sandra, who was a keen amateur photographer, but to his childhood, when he used to go up to the attic darkroom with his Uncle Ted and watch him processing and printing. He liked the printing best, when the blank piece of paper went in the developing tray and you could watch the image slowly forming. It seemed like magic. Every time they went over, he pestered his Uncle Ted to take him up. There was a safe light on the wall, too, he remembered, just enough to see by, and it gave an eerie glow in the small room. But mostly it was the sharp, chemical smells he remembered, and the way constant exposure to the chemicals made his Uncle Ted’s fingernails brown, the same way nicotine stained Banks’s fingers when he started smoking. He used to scrub it off with pumice stone so his mother wouldn’t notice.

Then the visits to Uncle Ted’s stopped abruptly and nobody ever said why. It was years before Banks thought about those days again and managed to work it out for himself. He remembered his uncle’s hand on the small of his back, perhaps rubbing just a little, or the arm draped casually across his shoulders in an avuncular way. Nothing more. Never anything more. But there was some kind of scandal – not involving Banks, but someone else. Uncle Ted suddenly broke off his connection with the local Youth Club and no longer acted as a Boys’ Brigade leader. Nothing was said, no police were involved, but he was suddenly a pariah in the community. That was how things like that were dealt with back then in that sort of close working-class community. No doubt one or two of the local fathers lay in wait one night and gave him a beating, too, but Banks heard nothing about that. Uncle Ted was simply never mentioned again, and if Banks ever asked to go visit or mentioned the name, his mother’s mouth formed into a tight white line – a definite warning sign to shut up or else. Eventually, he stopped mentioning it and moved on to discovering girls.

“Okay,” said Craig, emptying out the fixer and inserting a hose attached to the cold water tap. “We’re all right for half an hour now.”

Banks followed him downstairs, still half-lost in memories of Uncle Ted, slowly moving to memories of Sandra, and how they made love in the red glow of her darkroom once.

Back in the living room, “The Simpsons” had given way to a documentary on Hollywood narrated in a plummy, superior accent. Craig turned the TV off and they sat down opposite one another in the narrow room.

Banks reached for his cigarettes; he’d been a long time without. “Mind if I smoke?”

“No, not at all.” Craig passed him a small ashtray from the mantelpiece. “I don’t indulge, myself, but it doesn’t bother me.”

“Not cigarettes, anyway.”

Craig blushed. “Well, a bit of weed never did anyone any harm, did it?”

“I suppose not.”

He continued to study Banks, his look wary and suspicious. “So, you’re Louisa’s father,” he said. “Funny, you don’t look Italian. She said her father was Italian. Met her mother in Tuscany or somewhere like that on holiday.”

“What did she say about me?”

“Not much. Just that you were a boring, tight-arsed old fart.”

Well, Banks thought, if you will go around assuming other people’s identities, you have to be prepared for the occasional unflattering remark – especially if that identity is Jimmy Riddle’s. On that score, Emily Riddle probably wasn’t far wrong. “Do you know where Louisa is?” he asked.

“Haven’t seen her for a couple of months,” said Craig. “Not since I moved out here.”

Banks showed him the photo. “This is the person we’re talking about, isn’t it?”

Craig looked at the photo and gasped. “You’ve seen them, then?”

“Yes. Is it the same girl we’re talking about?”

“Yeah. That’s her. Louisa.”

“My daughter. What happened? The photos on the Web site?”

“Look, I’m sorry. It was just a lark, really. It was her as much as me. More, really. Though I don’t expect you to believe me.”

“You took the photos?”

“Yes. We were living together at the time. Three months ago.”

“Here?”

“No. I was still in London then. Had a little flat in Dulwich.”

Emily Riddle was a fast worker, Banks thought. Only away from home three months and she was living with someone. “How did they get onto the GlamourPuss Web site?”

Craig looked away, into the empty fireplace. “I’m not proud of it,” he said. “I used to do some work for them. I went to school with one of the blokes who run the site, and I met him in a pub when I was a bit down on my luck, just after college. I’d studied photography, got my diploma, but it was hard to get started in the business. Anyway, he offered me a bit of paying work every now and then. Models. It didn’t seem that much different from life studies in college.”

It probably didn’t, really, Banks thought. Sandra was a photographer, too, and Banks had seen plenty of life studies she had taken at the camera club, male and female. He pointed to the cropped photo of Louisa. “You got paid for this?”

“No. Good Lord, no. This wasn’t paid work. Like I said, it was a lark. A bit of fun. We were… well, we’d been smoking a bit of weed, if you must know. After I’d taken them, Louisa said I should put them on the Web with some of the other stuff I’d done – the professional stuff. She said it would be really cool. Rick said he liked them, so we put them up in the amateurs gallery. But that’s all. I mean Louisa doesn’t have any connection with the rest of the GlamourPuss business.”

Just what Aitcheson had said at the office. Maybe it was true. “I’m glad to hear that. Are you sure?”

“Certain. She never did. The photos were just a one-off. A joke. I was trying out a new digital camera and… well, one thing led to another.”

“Okay,” said Banks, waving his hand. “Let’s put that behind us. I’d really like to find Louisa, just to talk to her. I’m sure you understand. Can you tell me where she is?”