I did not enjoy this book. The early Bosch novels feel like they're powered mostly by mystery and by the main character's need to solve all of these crimes. This book -- well, its main character is a reporter whose brother was a police officer. After said twin brother commits suicide, the main character, Jack McEvoy, gets suspicious of the circumstances and ends up launching a nationwide investigation into a serial killer. THAT ALONE would have been fascinating and an intriguing story to follow -- but Connelly, perhaps after mainlining some James Ellroy, felt the need to make a long, rambling subplot out of the molestation, murder, and disfigurement of children. He also wrote passages from the point of view of the men who enjoyed doing this -- making whole sections of the book not only ultimately pointless to its conclusion, but nearly impossible to read.
I read this because it's relevant to the next book in the Connelly Bosch series, The Narrows. Now, I'm not sure I want to read that book at all.