Discover the classic, behind-the-scenes chronicle of John E. Douglas' twenty-five-year career in the FBI Investigative Support Unit, where he used psychological profiling to delve into the minds of the country's most notorious serial killers and criminals. In chilling detail, the legendary Mindhunter takes us behind the scenes of some of his most gruesome, fascinating, and challenging cases—and into the darkest recesses of our worst nightmares.