The legendary FBI criminal profiler, number-one New York Times bestselling author, and inspiration for the hit Netflix show Mindhunter delves deep into the lives and crimes of four of the most disturbing and complex predatory killers, offering never-before-revealed details about his profiling process, and divulging the strategies used to crack some of America’s most challenging cases. The FBI’s pioneer of criminal profiling, former special agent John Douglas, has studied and interviewed many of America’s most notorious killers—including Charles Manson, ”Son of Sam Killer” David Berkowitz and ”BTK Strangler” Dennis Rader—trained FBI agents and investigators around and the world, and helped educate the country about these deadly predators and how they operate, and has become a legend in popular culture, fictionalized in The Silence of the Lambs and the hit television shows Criminal Minds and Mindhunter. Twenty years after his famous memoir, the man who literally wrote the book on FBI