Bosch unfolded the paper. There were two columns of dates. Locke leaned over the table into the light to study the columns. Bosch could see a thin line, a scar, on the top of his bald and freckled crown.

“On Group A we now have a pattern,” Bosch continued. “A clearly discernable pattern of intervals. We have thirty days, thirty-two, twenty-eight, thirty-one, thirty-one, twenty-eight, twenty-seven and thirty. On Group B we have eighty-four days between the two killings.”

“Better stress management.”

“What?”

“The intervals between the acting out of these fantasies is dictated by the buildup of stress. I testified about this. The better the actor handles it, the longer the interval between killings. The second killer has better stress management. Or, at least, had it back then.”

Bosch watched him pace the room. He took out a cigarette and lit it. Locke said nothing.

“What I want to know is, is this possible?” Bosch asked. “I mean, is there any precedent for this that you know of?”

“Of course, it’s possible. The black heart does not beat alone. You don’t even have to look outside the boundaries of your own jurisdiction to find ample evidence it is possible. Look at the Hillside Stranglers. There was even a book written about them calledTwo of a Kind.

“Look at the similarities in the method of operation employed by the Nightstalker and the Sunset Strip Strangler in the early eighties. The short answer is, yes, it’s possible.”

“I know about those cases but this is different. I worked some of those and I know this is different. The Hillside Stranglers worked together. They were cousins. The other two were similar but there were major differences. Here, someone came along and copied the other exactly. So closely that we missed it and he got away.”

“Two killers working independently of each other but using exactly the same methodology.”

“Right.”

“Again, I say anything is possible. Another example: remember in the eighties there was the Freeway Killer in Orange and LA counties?”

Bosch nodded. He had never worked those cases so he knew little about them.

“Well, one day they got lucky and caught a Vietnam vet named William Bonin. They tied him to a handful of the cases and believed he was good for the rest. He went to death row but the killings kept happening. They kept right on happening until a highway patrol officer pulled over a guy named Randy Kraft who was driving down the freeway with a body in his car. Kraft and Bonin didn’t know each other but for a while they secretly shared the nom de plume ‘The Freeway Killer’. Each working independently of the other, out there killing. And being mistaken for the same person.”

That sounded close to the theory Bosch was working with. Locke continued talking, no longer bothered by the late-night intrusion.

“Do you know, there is a guard on death row at San Quentin whom I know from doing research up there. He told me there are four serial killers, including Kraft and Bonin, waiting for the gas. And, well, the four of them play cards every day. Bridge. Among them, they’ve got fifty-nine convictions for murder. And they play bridge. Anyway, the point is, he says Kraft and Bonin think so much alike that as a team they are almost never beaten.”

Bosch started refolding the map. Without looking up, he said, “Kraft and Bonin, did they kill their victims the same way? The exact same way?”

“Not exactly. But my point is that there could be two. But the follower in this case is smarter. He knew exactly what to do to have all the police go the other way, to put it on Church. Then, when Church was dead and no longer available for use as camouflage, the follower went underground, so to speak.”

Bosch looked up at him and a thought suddenly struck him that spun everything he knew into a new light. It was like the cue ball hitting a rack of eight, colors shooting off in all directions. But he didn’t say anything. This new thought was too dangerous to bring up. Instead he asked Locke a question.

“But even when this follower went underground, he kept the same program as the Dollmaker,” Bosch said. “Why do it, if no one was going to see it? Remember, with the Dollmaker we believed his leaving of the bodies in public locations, their faces painted, was part of the erotic program. Part of his turn-on. But why did the second killer do it-follow the same program-if the body was never intended to be found?”

Locke put both hands on the table to brace his weight and thought a moment. Bosch thought he heard a sound from the patio. He looked through the open French doors and saw only the darkness of the steep hillside rising above the illuminated pool. Its kidney-shaped surface was calm now. He looked at his watch. It was midnight.

“It’s a good question,” Locke said. “I don’t know the answer. Maybe the acolyte knew that eventually the body would be revealed, that he himself might want to reveal it. You see, we probably have to assume now that it was the follower who sent the notes to you and the newspaper four years ago. It shows the exhibitionistic portion of his program. Church apparently didn’t find the same need to torment his hunters.”

“The follower got off on tweaking us.”

“Exactly. What he was doing was having his fun, taunting his trackers and all the while the blame for the murders he committed went to the real Dollmaker. Follow?”

“Yes.”

“Okay, so what happened? The real Dollmaker, Mr. Church, is killed by you. The follower no longer has a cover. So what he does is, he continues his work-his killing-but now he buries the victim, hides her under concrete.”

“You’re saying he still follows the whole erotic program with the makeup and everything but then buries her so no one will see her?”

“So no one will know. Yes, he follows the program because that is what turned him on in the first place. But he can no longer afford to discard the bodies publicly because that would reveal his secret.”

“So then, why the note? Why send a note to the police this week that opens him to exposure?”

Locke paced around the dining room table thinking.

“Confidence,” he finally said. “The follower has become strong over the past four years. He thinks he is invincible. It is a common trait in the disassembling phase of a psychopath. A state of confidence and invulnerability rises as, in actuality, the psychopath is making more and more mistakes. Disassembling. Becoming vulnerable to discovery.”

“So because he has gotten away with his actions for four years, he thinks he is clear and is so untouchable that he sends another note to tweak us?”

“Exactly, but that is only one factor. Another is pride, authorship. This big trial on the Dollmaker has begun and he wants to steal some of the attention. You must understand, he craves attention for his acts. After all, it was the follower, not Church who sent the letters earlier. So being prideful and feeling above the reach of the police-I guess, godlike is the way to describe his sense of himself-he writes the note this week.”

“Catch me if you can.”

“Yes, one of the oldest games around… And lastly, he might have sent the note because he is still angry with you.”

“Me?”

Bosch was surprised. He had never considered this.

“Yes, you took Church away. You ruined his perfect cover. I don’t imagine the note and its mention in the press has helped your court case any, has it?”

“No. It might sink me.”

“Yes, so maybe this is the follower’s way of repaying you. His revenge.”

Bosch thought about all of this for a moment. He could almost feel the adrenaline surging through his body. It was after midnight but he wasn’t the least bit tired. He had a focus now. He was no longer lost in the void.

“You think there are more out there, don’t you?” he asked.

“You mean women in concrete, or similar confinement? Yes, unfortunately, I do. Four years is a long time. Many others are out there, I’m afraid.”