"Eyebrows," Frank said, tapping the ID shot--I had to stop myself from jumping--"eyebrows are good. Eyes are good. Lexie's fringe is shorter, you'll need a trim; apart from that, the hair's good. Ears--turn to the side for a second?--ears are good. Yours pierced?"

"Three times," I said.

"She only had two. Let's have a look . . ." Frank leaned in. "Shouldn't be a problem. I can't even see 'em unless I'm looking for them. Nose is good. Mouth is good. Chin's good. Jawline's good." Sam blinked, a rapid flick like a wince, on every one.

"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 cliche, 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."