The Fourth Monkey by J.D. Barker. Published by Houghton Mifflin Harcourt

Settle in for a good long while, because once you start this book, you won’t be doing anything until you turn the last page. This is a thriller with all the right elements, a tormented cop with his own problems, a sadistic killer who loves playing games with the police and the public, and a countdown that will leave you breathless. The Fourth Monkey Killer has held the residents of Chicago in the grip of terror for over five years and police have been unable to get any real leads on him. Not until, that is, his body is found. Sighs of relief are heard throughout the Windy City. But detective Sam Porter, head of the Fourth Monkey task force doesn’t have that luxury. he believes the killer may have one last victim, alive, at least for now. But where is she? Using the diary found on the killer’s body, Sam has to enter the mind of the most sadistic, most twisted killer he’s ever encountered . This is a relentless thrill ride that allows readers not only inside the mind of the killer, but of the man committed to outsmarting him this one last time