In addition, my years of work on these cases often added another experienced perspective to that of the police team-and sometimes it resulted in recalling a distinctive detail or trait that would lead the investigators to a repeat offender in this category of crimes in which the recidivist rate was so extraordinarily high.

Mercer started the engine and turned up the heat in the old department Crown Vic that had responded to more sexual assaults than most officers ever would in a lifetime. "So, did anything there speak to you?" Mercer said, smiling at me.

I rubbed my gloved hands together against the harsh winter chill that had seeped through the cracks around the car windows. Lots of veteran cops got vibes at crime scenes, claiming to be able to figure out something about the assailant by being in the same space. I shook my head. "Nothing you don't already know. Yet one more sick puppy who was somehow aroused by forcing a woman he'd never seen before to engage in a sexual act."

"There are buildings with doormen on both corners of the block. This is a fully occupied brownstone on a well-lighted street. He's a cool case, this guy. He got her at the front door on top of the stoop, as she was unlocking it-"

"She told you that?"

Mercer had been waiting at the hospital when the young woman emerged from the anesthetic late last evening. "Too many tubes coming out of the kid to speak, and the docs only gave me fifteen minutes with her. I asked some basics until she ran out of steam. She squeezed my hand like I told her for some yes-and-no kind of questions."

We were driving to the hospital, just a few blocks away on York Avenue at Sixty-eighth Street. Mercer stopped in to check on his victim on the way to his office this morning, and insisted on seeing her again, as he would every day until she recovered. He wanted to tell the young exchange student that he had telephoned her parents, in Sweden, and that they were flying here tomorrow. Until they arrived, he would be the closest thing to family she would have at her side.