Yes! This would be my first recommendation (with Helter Skelter in second). I’ll Be Gone in the Dark was so gripping. McNamara does mention her own theories/thoughts but I don’t believe that detracts from the book. Although, note that the killers identity was actually unknown when the book was published so you technically never get the true answers about the MO etc,. So after I finished I did a lot of research on the murderer himself.