In 1974, Dennis Lynn Rader stalked and murdered a family of four in Wichita, Kansas. Since adolescence, he had read about serial killers and imagined becoming one. Soon after killing the family, he murdered a young woman and then another, until he had ten victims. He named himself "B.T.K." (bind, torture, kill) and wrote notes that terrorized the city. He remained on the loose for thirty years. No one who knew him guessed his dark secret. He nearly...