Do you think readers can learn more about the origins of some of your characters and plots by reading this book? 

Yes, that was the purpose of it. In some cases it is obvious — a few of these stories contain entire plot elements from the novels. In others it is much more subtle, particularly in the elements of character. I think when you read about some of these detectives you should be able to see Harry Bosch in there.

The parts in your books where you talk about Harry's daughter are very tender. Do you think having children affects positively or negatively the way a police officer and a private investigator do their job?

My guess is that it has a significant impact. In Harry's case it brings a vulnerability to him that he didn't have before. He believes that he is on some sort of mission in life and he consciously built himself to be bulletproof — to be a man that nobody can get to. But when he found out he was a father he knew in that very moment that he was vulnerable, that he could be gotten to. That has to inform his work as an investigator. 

Have you been surprised by the popularity of this book? I understand the initial printing was smaller than usual for your books.

Yes. It was initially published as sort of an academic book in a very small printing. I thought it might be something good for the shelves of libraries. But then Little, Brown and Company took it and really teed it up and got it out there into a lot of places.