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 criminal profiling opens his case files once again. In this riveting work of true crime, he spotlights four of the most diabolical criminals he’s confronted, interviewed and learned from. Going deep into each man’s life and crimes, he outlines the factors that led them to murder and how he used his interrogation skills to expose their means, motives, and true evil. Like the hit Netflix