"You know," Frank said meditatively, a lot later, squinting into his glass, "you still haven't said no."

I didn't have the energy to get annoyed. "Have I said anything that sounds remotely like a yes?" I inquired.

He snapped his fingers. "Here, I've got an idea. There's a case meeting tomorrow evening. Why don't you come along? That might help you decide whether you want in."

And bingo, there it was: the hook in the middle of the lures, the real agenda behind all the chocolate biscuits and updates and concern for my emotional health. "Jesus, Frank," I said. "Do you realize how obvious you are?"

Frank grinned, not the least bit shamefaced. "You can't blame a guy for trying. Seriously, you should come. The floaters don't start till Monday morning, so it'll basically be just me and Sam, having a chat about what we've got. Aren't you curious?"

Of course I was. All Frank's info hadn't told me the one thing I wanted to know: what this girl had been like. I leaned my head back on the futon and lit another smoke. "Do you seriously think we could pull this off?" I asked.

Frank considered this. He poured himself another glass of wine and waved the bottle at me; I shook my head. "Under normal circumstances," he said at last, settling back into the sofa, "I'd say probably not. But these aren't normal circumstances, and we've got a couple of things in our favor, besides the obvious. For one thing, to all intents and purposes, this girl only existed for three years. It's not like you'd have to deal with a lifetime's worth of history here. You don't have to get by parents or siblings, you're not going to run into some childhood friend, nobody's going to ask you if you remember your first school dance. For another thing, during those three years, her life seems to have been pretty tightly circumscribed: she ran with one small crowd, studied in one small department, held down one job. You don't need to get the hang of wide circles of family and friends and colleagues."

"She was doing a PhD in English literature," I pointed out. "I know zip about English literature, Frank. I got an A in my Leaving Cert, but that's it. I don't speak the jargon."

Frank shrugged. "Neither did Lexie, as far as we know, and she managed to pull it off. If she can do it, so can you. Again, we're in luck there: she could've been doing pharmacy, or engineering. And if you get sweet fuck-all done on her thesis, well, hey, what do they expect? Ironically enough, that stab wound's going to come in useful: we can give you post-traumatic stress, amnesia, whatever we fancy."

"Any boyfriend?" There is a limit to what I'm prepared to do for the job.

"No, so your virtue is safe. And the other thing working for us: you know those photos? Our girl had a video phone, and it looks like the five of them used it as the group camcorder. The image quality's not brilliant, but she had a whacking great memory card and it's packed with clips--her and her mates on nights out, on picnics, moving into their new gaff, doing it up, everything. So you've got a ready-made guide to her voice, her body language, mannerisms, the tone of the relationships--everything a girl could ask for. And you're good, Cassie. You're a damn fine undercover. Put it all together, and I'd say we're in with a pretty good chance of pulling this off."