Don't !
I knew what happens having followed the story before and it didn't make it less gripping, but if you don't know, then this has a few major plot turns up its sleeve.
I just watched the last two episodes and thought this was fantastic. It covers a whole lot more than the cold case of a serial killer. There is a reason why the writer of the book this is based on herself is an important character in this. It also deals with popularity of true crime genre itself and especially why it is so popular with women (the entire series was written and directed by women). Most of all, rather than being about the murderer/rapist, it's very much about the women who survived and I thought they were incredible. They are given a voice and the women interviewed for the series are tremendously articulate and perceptive.