I first became aware of this book when Joseph James DeAngelo was arrested for the murders committed by The Golden State Killer. He was 72 at the time of his arrest, and was linked via DNA submitted to an ancestry website by a relative of his. I have been wanting to read it for a while, and finally got around to it. The author was very methodical in her research of the crimes, and the police also credited her activity in the case with raising awareness of the crimes. The author wound up dying before the book was published and never got to find out who the killer was. The book was really interesting, and I certainly learned a lot about the cases.