[The author] reveals [in this book] that a shocking 4 percent of ordinary people--one in twenty-five--has an often undetected mental disorder, the chief symptom of which is that that person possesses no conscience. He or she has no ability whatsoever to feel shame, guilt, or remorse ... They can do literally anything at all and feel absolutely no guilt ... Fundamentally, sociopaths are different because they cannot love. Sociopaths learn early on...

Boston Detective D. D. Warren cannot remember how she was attacked while walking the murder scene after dark. She is later told she managed to discharge her weapon three times. All she knows is that she is seriously injured, unable to move her left arm, unable to return to work. Six weeks later, a second woman is discovered murdered in her own bed. The only person who may have seen the killer is Detective D. D. Warren, who still cannot recall a single...

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.