TWO WOMEN WERE SITTING in Interrogation Room 1 when I got back. They owned a small placement service for nannies and au pairs, Cappy informed me. "A Nanny Is Love!"

"We called in when we heard about what happened," Linda Cliborne, in a pink cashmere sweater, explained to me. "We placed Wendy Raymore in that job."

"She seemed perfect for it," her partner, Judith Hertan, jumped in. Judith took out a yellow file and pushed it across the table. Inside was a filled-out A Nanny Is Love! application form, a couple of letters of recommendation, a Cal-Berkeley student ID with a photo on it.

"The Lightowers adored her," Linda said.

I stared at the small laminated photo of Wendy Raymore's face. She was blond with high cheekbones, a wide, blossoming smile. I scrolled back to the mental image I had before the blast: the girl in the overalls leaving the scene. This could be her.

"We carefully screen all of our girls. Wendy see............