psychologist had written. There were several, all with his name on the spine. There were several duplicates, too. Maybe, Bosch thought, so he could give them away. He saw five copies of Black Hearts, the book Locke had mentioned during his testimony, and three copies of a book called The Private Sex Life of the Public Porn Princess.

“You wrote about the porno business?”

He opened his eyes.

“Why, yes. That was the book I did before Black Hearts. Did you read it?”

“Uh, no.”

He closed his eyes again.

“Of course not. Despite the sexy title it really is a textbook. Used at the university level. Last I checked with my publisher, it was being sold in the bookstores at a hundred and forty-six universities, including Hopkins. It's been out two years, fourth printing, still haven't seen a royalty check. Would you like to read it?”

“I would.”

“Well, if you go by the student union on your way out of here, they sell it there. It's steep, I should warn you. Thirty bucks. But I'm sure you can expense it. I should also warn you, it's quite explicit.”

Bosch was annoyed that Locke didn't give him one of the extra copies on the shelf. Perhaps, it was Locke's childlike way of getting back at him for nixing the surveillance ride-along. He wondered what Melissa, the child-psych major, would make of such behavior.

“There is something else about this suspect. I don't know what it means.”

Locke opened his eyes but didn't move.

“He was divorced about a year before the Dollmaker killings began. In the divorce record there's mention by the wife that there was a loss of consortium. Would that still fit?”

“They stopped doing it, huh?”

“I guess. It was in the court file.”

“It could fit. But to be honest, we shrinks could find a way to make any activity fit into any prognosis we make. That's the field for you. But it could be a case where your suspect simply became impotent with his wife. He was moving toward the erotic mold, and she had no part in it. In effect, he was leaving her behind.”

“So it is not seen by you to be a cause for rethinking our suspicions of this man?”

“On the contrary. My view is that it is more evidence that he has gone through major psychological changes. His sexual persona is evolving.”

Bosch gave this some thought while trying to envision Mora. The vice cop spent every day in the tawdry milieu of pornography. After a while, he couldn't get it up for his own wife.

“Is there anything else you can tell me? Anything about this suspect that might help us? We don't have anything on him. No probable cause. We can't arrest him. All we can do is watch. And that gets dangerous. If we lose him—”

“He could kill.”

“Right.”

“And then you are still left with no probable cause, no evidence.”

“What about trophies? What do I look for?”

“Where?”

“In his home.”

“Ah, I see. You plan to continue your professional interaction with him, to visit him at home. On a ruse, perhaps. But you won't be able to move about freely.”

“I might be able to, if someone else keeps him occupied. I'll go with somebody else.”

Locke leaned forward in his chair, his eyes wide. It was starting again, his excitement.

“What if you kept him busy and I had a look around? I am the expert on this, Harry. You would be better at keeping him busy. You could talk detective talk, I'd ask to use the bathroom. I would have a better grasp of—”

“Forget it, Dr. Locke. Listen to me, there is no way it's going to happen that way. Okay? It's too dangerous. Now, do you want to help me here or not?”

“Okay, okay. Again, I'm sorry. The reason I am so excited by the prospect of being inside this man's house and mind is that I think that this man, who is on a killing cycle of seven months plus, would almost certainly have trophies that would help him feed into his fantasy and recreate his kills, thereby dulling urges to physically act out.”

“I understand.”

“You've got a man with an unusually long cycle. Believe me, during those seven months the impulses to act out, to go out and kill, do not lie dormant. They are there. They are always there. Remember the erotic mold? I testified about it?”

“I remember.”

“Okay, well, he is going to need to satisfy that erotic mold. To fulfill it. How does he do it? How does he last six or seven or