Download or read book The Unknown Darkness written by Gregg O. McCrary and published by . This book was released on 2005-06-01 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Unknown Darkness is an intense close-up look at the hunter and the hunted in incredible games of cat-and-mouse. Behavioral Science veteran McCrary is both modest and brilliant as he tracks down the predators among us.