The FBI profiler & co-author of the #1 New York Times–bestseller Mindhunter recounts his role in catching one of America’s most notorious serial killers. Inside the Mind of BTK tells the incredible true story of how FBI profiler John Douglas tracked and participated in the hunt for one of the most notorious serial killers in US history. For thirty-one years a man who called himself BTK (Bind, Torture, Kill) terrorized the city of Wichita, Kansas, sexually assaulting and strangling a series of victims, taunting the police with cryptic communications, and bragging about his vicious crimes to local newspapers and television stations. After disappearing for nine years, he suddenly reappeared, complaining that no one was paying enough attention to him and claiming that he had committed other crimes for which he had not been given credit. When he was finally captured, BTK was revealed to be Dennis Rader, a sixty-one-year-old churchgoing, married man with two children. As a leading serial killer profiler for the FBI, John Douglas was first called to consult about the case in 1980 and remained involved with the story and all of its principal players up to the arrest and prosecution. After Rader was arrested, Douglas was granted both an exclusive interview with the killer after his sentencing, as well as access to friends, family, and police. In this page-turning book, Douglas reveals both new information and insight into why Rader did what he did, why he stopped for a mysterious nine-year period, and his current psychological state in custody.