The first in the 4MK Thriller series comes a dark and twisting novel from the author Jeffrey Deaver called "a talented writer with a delightfully delicious mind." Two days to save her . . . For over five years, the Four Monkey Killer has terrorized the residents of Chicago. When his body is found, the police quickly realize he was on his way to deliver one final message, one which proves he has taken another victim who may still be alive. One day . . . As the lead investigator on the 4MK task force, Detective Sam Porter knows that even in death, the killer is far from finished. When he discovers a personal diary in the jacket pocket of the body, Porter finds himself caught up in the mind of a psychopath, unraveling a twisted history in hopes of finding one last girl, all while struggling with personal demons of his own. Zero. With only a handful of clues, the elusive killer''s identity remains a mystery. Time is running out as the Four Monkey Killer taunts from beyond the grave in this masterfully written fast-paced thriller.

“The Fourth Monkey has one of the most ingenious openings that I’ve read in years. This thriller never disappoints.”—James Patterson, #1 New York Times bestselling author     “A first-rate, devilish thriller.”—Eric Rickstad, New York Times bestselling author of The Names of Dead Girls and The Silent Girls   "This book lives up to the hype....fast paced, complex and filled with twists and turns, once I picked up this novel, it was incredibly hard to put down....At this point, this novel has me feeling a serious “book hangover”. And, with that ending, I am really hoping this will not be the last that I will read about these characters. 5/5 stars. A must read." —** Clues and Reviews   "Bram Stoker Award finalist Barker ingeniously blends horrific images into a bizarre plotline to create this devilishly dark thriller."— Library Journal   “…Nice twists on classic thriller tropes.” —Publisher’s Weekly   “Superbly constructed and immaculately paced, this is one of the few serial killer thrillers that bears comparison with Thomas Harris’s 1981 masterpiece Red Dragon.”—Daily Mail   “J.D. Barker’s second novel is a terrifying romp.”—Pittsburgh Post-Gazette   “Not since Hannibal Lecter had a friend for dinner has a serial killer been so skillfully rendered on the page.” —Taylor Elmore, Writer/Producer of Justified and Limitless “Creepy, scary . . . and impossible to put down! The Fourth Monkey is everything a thriller should be—a must read!” —Heather Graham, NY Times Bestselling Author “In the tradition of SE7EN and THE USUAL SUSPECTS, THE FOURTH MONKEY combines breakneck speed with a baffling puzzle. It has pace to die for.” —David Morrell, New York Times Bestselling Author of Murder As a Fine Art and First Blood “A chillingly delicious page-turner.” —Kelley Armstrong, NY Times Bestselling Author  “Gritty, masterful suspense…Lee Child, you’ve met your match.” —*