If this mystery girl had walked into my classroom one morning, back then, it would have made my year. Since she didn't, I grew up, got a grip and stopped thinking about it. Now, all of a sudden, I had the best reflection on the block, and I didn't like it one bit. I had got used to being just me, no links to anyone. This girl was a link like a handcuff, slapped on my wrist out of nowhere and tightened till it bit to the bone.

And I knew how she had picked up the Lexie Madison ID. It was in my head bright and hard as broken glass, clear as if it had happened to me, and I didn't like this either. Somewhere in town, at the bar in a crowded pub or flipping through clothes in a shop, and behind her: Lexie? Lexie Madison? God, I haven't seen you in ages! And after that it would have been just a matter of playing it carefully and asking the right casual questions (It's been so long, I can't even remember, what was I doing last time I saw you?), picking her way delicately to everything she needed to know. She had been no dummy, this girl.

Plenty of murder cases turn into knock-down-drag-out battles of wits, but this was different. This was the first time I had felt like my real opponent wasn't the murderer but the victim: defiant, clenching her secrets white-knuckle tight, and evenly, perfectly matched against me in every way, too close to call.

By Saturday lunchtime I had made myself nuts enough that I climbed up on the kitchen counter, took down my Official Stuff shoebox from the top of a cupboard, dumped the documents on the floor and went through them for my birth cert. Maddox, Cassandra Jeanne, female, six pounds ten ounces. Type of birth: single.

"Idiot," I said, out loud, and climbed back up on the counter.

* * *

That afternoon, Frank called round. At this stage I was so stir-crazy--my flat is small, I'd run out of stuff to clean--that I was actually glad to hear his voice over the intercom.

"What year is it?" I asked, when he reached the top of the stairs. "Who's the president?"

"Quit bitching," he said, giving me a one-armed hug around the neck. "You've got this whole lovely flat to play in. You could be a sniper stuck in a hide, not moving a muscle for days on end and pissing into a bottle. And I brought you supplies."

He handed me a plastic bag. All the main food groups: chocolate biscuits, smokes, ground coffee and two bottles of wine. "You're a gem, Frank," I said. "You know me too well." He did, too; four years on, and he had remembered I like Lucky Strike Lights. The feeling wasn't a reassuring one, but then he hadn't intended it to be.

Frank raised a noncommittal eyebrow. "Got a corkscrew?"

My antennae went up, but I can hold my booze fairly well, and Frank had to know I wasn't stupid enough to get drunk with him. I threw him a corkscrew and rummaged for glasses.