“Your cheekbones and clavicles appear to be more pronounced than the victim’s,” Cooper said, studying me with vaguely creepy professional interest. “May I ask how much you weigh?”

I never weigh myself. “A hundred and something. Sixteen? seventeen?”

“You’re a little thinner than she was,” Frank said. “No problem; a week or two of hospital food’ll do that. Her clothes are size six, jeans waist twenty-nine inches, bra size 34B, shoe size seven. All of that sound like it’ll fit?”

“Near enough,” I said. I wondered how the fuck my life had ended up here. I thought about finding some magic button that would rewind me, at lightning speed, till I was lounging happily in the back corner kicking Rob in the leg every time O’Kelly came out with a cliché, instead of standing here like a Muppet showing people my ears and trying to stop my voice shaking while we discussed whether I would fit into a dead girl’s bra.

“A brand-new wardrobe,” Frank told me, grinning. “Who says this job doesn’t have perks?”

“She could do with it,” O’Kelly said bitchily.

Frank moved on to the full-length shot, drew a finger down it from shoulders to feet, glancing back and forth at me. “Build is all good, give or take the few pounds.” His finger on the photo made a long dragging squeak; Sam shifted, sharply, in his chair. “Shoulder width looks good, waist-to-hip ratio looks good-we can measure, just to be sure, but the weight difference gives us a little leeway there. Leg length looks good.”

He tapped the close-up. “These are important; people notice hands. Give us a look, Cassie?”

I held out my hands like he was going to cuff me. I couldn’t make myself look at the photo; I could barely breathe. This was one question to which Frank couldn’t already know the answer. This could be it: the difference that would slice me away from this girl, sever the link with one hard final snap and let me go home.

“Those right there,” Frank said appreciatively, after a long look, “may be the loveliest hands I’ve ever seen.”

“Extraordinary,” Cooper said with relish, leaning forwards to peer at me and AnonyGirl over his glasses. “The odds must be one in millions.”

“Anyone seeing any discrepancies?” Frank asked the room.

No one said anything. Sam’s jaw was tight.

“Gentlemen,” Frank said, with a flourish of his arm, “we have a match.”

“Which doesn’t necessarily mean we need to do anything with it,” said Sam.

O’Kelly was doing a sarcastic slow clap. “Congratulations, Mackey. Makes a great party trick. Now that we all know what Maddox looks like, can we get back to the case?”

“And can I stop standing here?” I asked. My legs were trembling like I’d been running and I was furiously pissed off with everyone in sight, including myself. “Unless you need me for inspiration.”

“You can, of course,” Frank said, finding a marker for the whiteboard. “So here’s what we’ve got. Alexandra Janet Madison, aka Lexie, registered as born in Dublin on the first of March 1979-and I should know, I registered her myself. In October 2000”-he started sketching a timeline, fast straight strokes-“she entered UCD as a psychology postgrad. In May of 2001, she dropped out of college due to stress-related illness and went to her parents in Canada to recover, and that should’ve been the end of her-”

“Hang on. You gave me a nervous breakdown?” I demanded.

“Your thesis was getting on top of you,” Frank told me, grinning. “It’s a tough old world, academia; you couldn’t take the heat, so you got out of the kitchen. I had to get rid of you somehow.”

I rearranged myself against my wall and made a face at him; he winked at me. He had played straight into this girl’s hands, years before she ever came on the scene. Any slip she made when she ran into that old acquaintance and started trawling for info, any off-kilter pause, any reluctance to meet up again: Well, you know she did have that nervous breakdown…

“In February 2002, though,” Frank said, switching from blue marker to red, “Alexandra Madison shows up again. She pulls her UCD records and uses them to wangle her way into Trinity to do a PhD in English. We don’t have a clue who this girl actually is, what she was doing before then, or how she hit on the Lexie Madison ID. We ran her prints: she’s not in the system.”

“You might want to widen the net,” I said. “There’s a decent chance she’s not Irish.”

Frank glanced at me sharply. “Why’s that?”

“When Irish people want to hide, they don’t hang around here. They go abroad. If she was Irish, she’d have run into someone from her mammy’s bingo club inside a week.”

“Not necessarily. She was living a pretty isolated life.”

“As well as that,” I said, keeping my voice level, “I take after the French side. Nobody thinks I’m Irish, till I open my mouth. If I didn’t get my looks here, odds are neither did she.”

“Great,” O’Kelly said, heavily. “Undercover, DV, Immigration, the Brits, Interpol, the FBI. Anyone else who might want to join the party? The Irish Countrywomen’s Association? The Vincent de Paul?”

“Any chance of getting an ID off her teeth?” Sam asked. “Or a country, even? Can’t you tell where dental work was done?”

“The young woman in question had excellent teeth,” Cooper said. “I am not, of course, a specialist in the field, but she had no fillings, crowns, extractions or other readily identifiable work.”

Frank arched an inquiring eyebrow at me. I gave him my best puzzled look.

“The two bottom front teeth overlap slightly,” Cooper said, “and one top molar is significantly misaligned, implying that she had no orthodontic work done as a child. I would hazard that the possibility of dental identification is practically nonexistent.” Sam shook his head, frustrated, and went back to his notebook.

Frank was still eyeballing me, and it was getting on my nerves. I shoved myself off the wall, opened my mouth wide at him and pointed at my teeth. Cooper and O’Kelly gave me identical horrified looks.

“No, I don’t have fillings,” I told Frank. “See? Not that it matters anyway.”

“Good girl,” Frank said approvingly. “Keep flossing.”

"That’s lovely, Maddox,” O’Kelly said. “Thanks for sharing. So in autumn of 2002 Alexandra Madison goes into Trinity, and in April 2005 she turns up murdered outside Glenskehy. Do we know what she was doing in between?”

Sam stirred and looked up, put down his pen. “Her PhD, mostly,” he said. “Something to do with women writers and pseudonyms; I didn’t understand the whole of it. She was doing grand, her supervisor says-a bit behind schedule, but what she came up with was good. Up until September she was living in a bedsit off the South Circular Road. She paid her way with student loans, grants, and by working in the English department and in Caffeine, in town. She had no known criminal activity, no debts except the loan for her college fees, no dodgy activity on her bank account, no addictions, no boyfriend or ex-boyfriend”-Cooper raised an eyebrow-“no enemies and no recent arguments.”

“So no motive,” Frank said musingly, to the whiteboard, “and no suspects.”

“Her main associates,” Sam said evenly, “were a bunch of other postgrads: Daniel March, Abigail Stone, Justin Mannering and Raphael Hyland.”

“Bloody silly name,” said O’Kelly. “He a poof, or a Brit?” Cooper closed his eyes briefly in distaste, like a cat.

“He’s half English,” Sam said; O’Kelly gave a smug little grunt. “Daniel has two speeding tickets, Justin has one, apart from that they’re all clean as a whistle. They don’t know Lexie was using an alias-or if they do, they’ve said nothing. According to them, she was estranged from her family and didn’t like talking about her past. They don’t even know where she was from; Abby thinks maybe Galway, Justin thinks Dublin, Daniel gave me a snotty look and told me that ‘wasn’t really of interest’ to him. They’re the same about her family. Justin thinks her parents were dead, Rafe says divorced, Abby says she was illegitimate…”"