Evil at Heart, by Chelsea Cain, is book #3 of a series which features serial killer, Gretchen Lowell, and Detective Archie Sheridan, who have played a game of cat and mouse in the first two books: Heartsick, and Sweetheart. Although the author uses flashbacks in each novel, which is helpful for recall, or to those who have not read the prior books, this series is so good, I'd recommend reading the books in order to get the full gruesome effect.
Gretchen is a sexy, serial killer, know as the "Beauty Killer". Sensationalized by the media, there is even a tour bus that visits the sites around Portland, Oregon where her victims were found. She leaves her trademark on her victims, similar mutilating marks on the body, and removal of various body parts (eyeballs being a specialty).
I don't want to give away any details so just let me say, if you don't mind a gruesome story with lots of graphic detail, this psychological thriller is not to be missed. Fast-paced and extremely creepy, this book did not disappoint. I can't tell if there will be a book #4 to this series, but I certainly hope so. ---RECOMMENDED
(This review was based on a library book I borrowed :)
Here is a link to a brief YouTube video about this book (you'll get the feel of it without giving the plot away).....CLICK HERE.