In a new book, "Inside the Mind of BTK," the eminent F.B.I. criminal profiler John Douglas tells the story of a serial killer who stalked the streets of Wichita, Kansas, in the nineteen-seventies and eighties. Douglas was the model for Agent Jack Crawford in "The Silence of the Lambs." He was the protégé of the pioneering F.B.I. profiler Howard Teten, who helped establish the bureau's Behavioral Science Unit, at Quantico, in 1972, and who was a protégé of Brussel—which, in the close-knit fraternity of profilers, is like being analyzed by the analyst who was analyzed by Freud. To Douglas, Brussel was the father of criminal profiling, and, in both style and logic, "Inside the Mind of BTK" pays homage to "Casebook of a Crime Psychiatrist" at every turn.