Outside the door of the interrogation room I heard voices suddenly raised. One of them was Walter Cole’s. I didn’t recognize the other. The voices subsided again, but I knew that they were talking about me. I would find out what they wanted soon enough.

“Okay. The largest focus group for sexual sadists consists of white, female adults who are strangers to the killer, although they may also target males and, as in this case, children. There is also sometimes a correspondence between the victim and someone in the offender’s own life.

“Victims are chosen through systematic stalking and surveillance. The killer had probably been watching the family for some time. He knew the husband’s habits, knew that if he went to the bar then he would be missing for long enough to allow him to complete what he wanted to do. In this case, I don’t think the killer managed that completion.

“The crime scene is unusual in this case. Firstly, the nature of the crime means that it requires somewhere solitary to give the offender time with his victim. In some cases, the offender’s residence may have been modified to accommodate his victim, or he may use a converted car or van for the killing. In this case, the killer chose not to do this. I think he may like the element of risk involved. I also think he wanted to make, for want of a better term, an ‘impression.’ ”

An impression, like wearing a bright tie to a funeral.

“The crime was carefully staged to impact in the most traumatic way on the husband when he returned home.”

Maybe Walter had been right. Maybe I shouldn’t have come to the briefing. Wolfe’s matter-of-factness reduced my wife and child to the level of another gruesome statistic in a violent city, but I hoped that she would say something that would resonate inside me and provide some clue to drive the investigation forward. Two weeks is a long time in a murder case. After two weeks with no progress, unless you get very, very lucky, the investigation starts to grind to a halt.

“This seems to indicate a killer of above-average intelligence, one who likes playing games and gambling,” said Wolfe. “The fact that he appeared to want the element of shock to play a part could lead us to conclude that there was a personal element to what he did, directed against the husband, but that’s just speculation, and the general pattern of this type of crime is impersonal.

“Generally, crime scenes can be classified as organized, disorganized, or some mix of the two. An organized killer plans the murder and targets the victim carefully, and the crime scene will reflect this element of control. The victims will meet certain criteria which the killer has set: age, hair color maybe, occupation, lifestyle. The use of restraints, as we have in this case, is typical. It reflects the elements of control and planning, since the killer will usually have to bring them to the scene.

“In cases of sexual sadism, the act of killing is generally eroticized. There’s a ritual involved; it’s usually slow, and every effort is made to ensure that the victim remains conscious and aware up to the point of death. In other words, the killer doesn’t want to end the lives of his victims prematurely.

“Now, in this case he didn’t succeed, because Jennifer Parker, the child, had a weak heart and it failed following the release of epinephrine into her system. Combined with her mother’s attempted escape and the damage caused to her face by striking it against the wall, which may have resulted in temporary loss of consciousness, I believe the killer felt he was losing control of the situation. The crime scene moved from organized to disorganized, and shortly after he commenced flensing, his anger and frustration got the better of him and he mutilated the bodies.”

I wanted to leave then. I had made a mistake. Nothing could come of this, nothing good.

“As I said earlier, mutilation of the genitals and breasts is a feature of this type of crime, but this case doesn’t conform to the general pattern in a number of crucial ways. I think the mutilation in this case was either a result of anger and loss of control, or it was an attempt to disguise something else, some other element of the ritual which had already commenced and from which the killer was trying to divert attention. In all likelihood, the partial flensing is the key. There’s a strong element of display-it’s incomplete, but it’s there.”

“Why are you so sure it’s a white male?” asked Joiner, a black Homicide detective with whom I’d worked once or twice.

“The most frequent perpetrators of sexual sadism are white males. Not women, not black males. White males.”

“You’re off the hook, Joiner,” someone said. There was a burst of laughter, an easing of the tension that had built up in the room. One or two of the others glanced at me but for the most part they acted as if I wasn’t there. They were professionals, concentrating on amassing any information that might lead to a greater understanding of the killer.

Wolfe let the laughter fade. “Research indicates that as many as forty-three percent of sexual murderers are married. Fifty percent have children. Don’t make the mistake of thinking that you’re looking for some crazy loner. This guy may be the hero of his local PTA meetings, the coach of the Little League team.

“He could be engaged in a profession that brings him into contact with the public, so he’s probably socially adept and he may use that to target his victims. He may have engaged in antisocial behavior in the past, although not necessarily something serious enough to have gotten him a police record.

“Sexual sadists are often police buffs or weapons freaks. He may try to stay in touch with the progress of the investigation, so keep an eye on individuals who ring in with leads or who try to trade off information. He also owns a clean, well-maintained car: clean so it doesn’t attract attention, well maintained because he has to be sure he doesn’t get stranded at or near the crime scene. The car could have been modified to allow him to transport victims; the door and window handles in the rear will have been removed, the trunk may have been soundproofed. If you think you have a possible suspect, check the trunk for extra fuel, water, ropes, cuffs, ligatures.

“If you go for a search warrant, you’ll be looking for any items relating to sexual or violent behavior: pornographic magazines, videos, low-end true-crime stuff, vibrators, clamps, women’s clothing, particularly undergarments. Some of these may have belonged to victims or he may have taken other personal items from them. Look out also for diaries and manuscripts; they may contain details of victims, fantasies, even the crimes themselves. This guy may also have a collection of police equipment and almost certainly has a knowledge of police procedures.” Wolfe took a deep breath and sat back in her chair.

“Is he going to do it again?” asked Walter. There was silence in the room for a moment.

“Yes, but you’re making one assumption,” said Wolfe. Walter looked puzzled.

“You’re assuming this is the first. I take it a VICAP has been done?”

VICAP, operational since 1985, is the FBI’s Violent Criminal Apprehension Program. Under VICAP, a report is completed on solved or unsolved homicides or attempted homicides, particularly those involving abductions or that are apparently random or motiveless or sexually oriented; on missing persons cases, when foul play is suspected; and on unidentified dead bodies, when the manner of death is known or suspected to be homicide. The report is then submitted to the National Center for the Analysis of Violent Crime at the FBI’s academy in Quantico, in an effort to determine if similar pattern characteristics exist elsewhere in the VICAP system.

“It was submitted.”

“Have you requested a profile?”