I think this is a good book in that it can direct someone who is interested in true crime but knows little about it, towards a path of understanding what type of true crime interests them. Whether they prefer gang crime, cults, or just serial killers. This book is a solid start, but isn't incredibly informative when it comes to each case it details, and in fact with some cases there is misinformation. If someone were interested in any particular case, they'd be better off reading the beginning of the case in this book and then finding other books to go into further more accurate detail, as unfortunately this book struggles to accurately inform the reader of more of the finer details of the crime. This book is more like small Tumblr posts on each killer, with none of the information cited.
The writing felt careless at times - like a student trying to reach a wordcount for an overdue assignment at 3am, when they just want to go to bed. It just got slapped together and published.
All in all, I can see why this book was reduced in price ($19.95 down to $9.99) - and it seems I know about majority of the interesting cases anyway.