I had such high expectations for this book. Maybe too high. This book was very interesting… but the chapters were extremely long and I felt like certain stories lead to random tangents that John E. Douglas tried to tie together. Majority of the book is absolutely fascinating, and the authors really break down the process, and do a great job of explaining how they build a profile. It would be nice if the book was updated or amended to provided updated information regarding some of the cases covered. For example, the book states that the Green River Killer hasn’t been found/caught yet, when we know today that it was Gary Ridgeway. The authors updated the introduction of the book, so it seems plausible that the book can be updated with the most current information. I mostly wanted to read the book before I watched the Netflix series, but I honestly don’t know how much it will matter after reading the book. It was a good and very interesting read, but it definitely took me longer to get through than I am used to. I gave this book 3 out of 5 stars.