From one of the country's most preeminent criminal profilers comes this gripping, behind-the-scenes account of America's most disturbing and complex serial killer and murder investigations. A former Supervisory Special Agent in the FBI's Behavioral Science Unit, Gregg McCrary takes us deep into the minds of the nation's shrewdest and most sinister predators. In The Unknown Darkness, he digs beneath the crime scene to examine in raw first-person detail the lethal competition between the country's deviously dangerous killers and the dedicated professionals who are determined to get them off the streets.In the basement offices of the FBI Academy at Quantico, Virginia -- now familiar from the books and films The Silence of the Lambs and Hannibal -- McCrary served in one of the most elite forces for criminal investigation in the world, profiling criminals for over twenty-five years in more than a thousand cases involving homicide, serial murder, kidnapping, and sexual assault. He takes us inside his process on some of his most fascinating cases, including: The Sam Sheppard case -- In revisiting this classic case, what new material did McCrary's analysis discover? The Poet's Shadow -- The strange story of Jack Unterweger and the hunt for an international serial killer that had a bizarre twist. The Buddhist Temple Massacre -- What did the crime scene reveal about the shocking evil that resulted in the deaths of nine gentle people? The Unknown Darkness also explores the strengths and pitfalls of modern criminal investigation and offers vivid details about what happens at a crime scene, what is actually involved in bringing a killer to justice, and finally what kind of a person is able to devote his or her life to grappling with the predators among us. Daring to relive the often harrowing experiences of his time with the FBI, McCrary has put together an eye-opening account of ten of America's most frightening and riveting manhunts. He has also written an engrossing narrative on our justice system -- from the perspective of someone who has lived it day to day. Read Less