You have the body, you have the autopsy, you carry the news to the family. Here you are dealing with victims long dead. There are no autopsies, no physical crime scenes. You deal with the murder books-if you can find them-and the records. When you go to the family-and believe me you don’t go until you are good and ready-you find people who have already suffered the shock and found or not found ways to get past it. It wears on you. I hope you are prepared for that.”

“Thanks for the warning,” Bosch said.

“With fresh kills it is clinical because things move fast. With old cases it is emotional. You are going to see the toll of violence over time. Be prepared for it.”

Pratt pulled a thick blue binder from the side of his desk to the center of his calendar blotter. He started to push it across to them then stopped.

“Another thing to be prepared for is the department. Count on files being incomplete or even missing. Count on physical evidence being destroyed or disappeared. Count on starting from scratch with some of these. This unit was put together two years ago. We spent the first eight months just going through the case logs and pulling out open-unsolveds. We fed what we could into the forensics pipelines, but even when we’ve gotten a hit we have been handicapped by the lack of case integrity. It has been abysmal. It has been frustrating. Even though there is no statute of limitations on murder we are finding that evidence and even files were routinely disposed of during at least one administration.

“What I am saying is that you are going to find that your biggest obstacle on some of these cases may very well be the department itself.”

“Somebody said we have a cold hit that came out of one of our time blocks,” Bosch said.

He’d heard enough. He just wanted to get moving on something.

“Yes, you do,” Pratt said. “We’ll get to that in a second. Let me just finish up with my little speech.