I just can't see how the author's rehearsal dinner or her father's alcoholism relate in the least bit to this string of unsolved murders. Nor why a person telling a story about a serial killer would think that the readers of such a story would care at all about the author's childhood. Unless the author and the killer turn out to be related in a significant way (the killer was her uncle, or the kid that grew up around the corner). Spoiler alert - he isn't.
And it sucks because when the book is about the serial killer and the cases, it is really interesting. And THAT book would get 5 stars. Unfortunately, that book only makes up about 5% of this book.