I‘m tempted to give this a lower rating, but I realize that wouldn‘t be fair. B/C while I hated everything that happened in this book, I think that that was exactly the author‘s intention. I don‘t have a sister, & don‘t know any serial killers (that I‘m aware of), but I related to the narrator, who lives in the shadow of her beautiful, enigmatic, dangerous younger sibling, & their relationship reminded me of many past friendships-minus the murder.