(***SPOILER***... unless you have read the previous book, Devious... a notorious killer from a previous book is back. It's awesome and because it it just a secondary story in this book and its such a tease!)
Brianna Hayward is a twin-less twin; she lost her sister in high school and it changed her life forever. Brianna is now a psychiatrist who runs a help group for other like herself. She is also trying to prove her cousin is innocent of crimes he didn't commit. Her cousin was convicted of murdering his twin sisters on their twenty-first birthday, he was labeled the 21 Killer. Brianna is alone in her belief until one of her friends from the Twin-less Twin group discovers her twin daughters missing.
It should have been the best night of their lives, Zoe and Chloe were turning twenty-one but the night went wrong and now they are both hog tied naked in a basement room with a scary looking naked guy singing Happy Birthday, badly. Zoe always the strongest of the two tries to escape and now she is lost in the swamp separated from her twin. Chloe needs to be the strong one, after their attempted escape Chloe was recaptured; now she needs to get herself out of this before he catches Zoe again.
Bentz has no reason to believe Brianna Hayward, but something about it reminds him of Olivia and how they first meet. So he goes out on a limb and starts to follow up on the missing twins. Also thrown into the mix is crime reporter Jase Bridges. Jase went to school with Brianna and her sister and has a secret he has kept from Brianna for years but the attraction is there and he tries to stay away but the story of the 21 Killer and the missing twins is too good to pass up.
Overall, with all the emotional turmoil from both past and present experiences, and the suspense of being chased by a mad man it ties you up inside. If you haven't read any of the other books this would be a good one to start at.