A compelling career memoir by an award-winning neuroscientist describes how while studying his own family's brain scans for research he made the disturbing discovery that his own reflected a pattern he recognized from those in the brains of serial killers, a finding that offered new insights into the role of biology in behavior.

What is a psychopath? -- Evil brewing -- The brain of a killer -- Bloodlines -- A third leg to stand on -- Going public -- Love and other abstractions -- A party in my brain -- Can you change a psychopath? -- Why do psychopaths exist?.