I bought this book after seeing the film by David Fincher. The film, in my opinion, is excellent, holds your interest while telling a coherent story. That's where the book falls down, it's interesting but the story and the style are very up and down, some sections are filled with so many facts and names that they completely lose you, whereas other sections flow more like the film. Certain key film scenes are not in the book and the Robert Avery character is hardly mentioned. Obviously the book is real events and his interpretation on things whereas the film may have more license with scenes and also involve other people's recollections. I would say that if you are interested in true crime then it's a reasonable read, by someone who was involved in some way with the actual events, but if like me you were thinking about reading this purely on the strength of the film, then I wouldn't buy.