I bought a used copy a while ago. It's been a while since I read it, but I remember it not being as terrible as Dave Cullen's writing. It has a lot of writing about the victims and families, instead of just focusing on the killer. It was decent, nothing I would read again, but it isn't badly written or anything.
I can't PM on here because I don't have enough posts, but I would let you have my copy. I don't need it any more and I'd rather give it to someone who would read it over dumping it at a donation center.
My Reddit username is Sufficient-Weight-95, if you felt like sending a message I would mail it to you.