She gingerly moved over to where the purse was resting and peeked in. There was a jumble of the usual things: cosmetics, a ballpoint, a change purse, an address book, and a billfold. There also was the tan envelope. Yes!

The scene in the hallway was increasingly chaotic. Two of the researchers from the laboratory had come out, in their sterile whites, with disinfectant and a roll of bandages. As they began to bind her wound to stanch the bleeding, her eyelids fluttered and she groaned.

"She's just in shock," Van de Vliet said with relief. "Ellen, page Michael and tell him to bring the ambulance around front. Just in case. But I think we can handle this here."

Now two nurses were rolling a gurney off the elevator. While Van de Vliet and the two lab researchers lifted her onto it, Ally realized that nobody seemed to think that calling the police—about any of this—would be a constructive step.

She pulled out the letter and examined it. The oversize script on the front read Katherine Starr, 169 East 81st St. There was no return address.

Katherine Starr. She was repeating the name and address, trying to lodge them in her memory, while she was pulling the letter out of the tan envelope.

It was in the same rotund script as the address:

Dear Whoever You Are,

I think you 're my mother but I'm not sure. Please help me. I don't know where I am or what my name is. But I found a bracelet with Starr on it and I looked in the phone book. Your name sounded kind of familiar. I think I'm . . .

"I'd better take that," Van de Vliet said, lifting the letter out of Ally's hands. "All her personal effects should be kept with her."