Pioneering psychiatrist Dr. Dorothy Otnow Lewis has dedicated her life to studying the minds of murderers in order to understand why we kill. Featuring narration from Laura Dern, and highlighting Lewis’s research, never-before-seen death row interview tapes, and the formative experiences and neurological dysfunction of infamous murderers like Ted Bundy, this film challenges the notion that killers are made and not born — while raising provocative questions about the death penalty.