Describes the characteristics and neurological bases of disorders that "evil" people commonly have, discussing the personalities of figures such as Adolf Hitler and Mao Zedong and examining the malevolent behaviors of the author's sister.

$g Introduction -- $t In search of Machiavelli -- $t Psychopathy -- $t Evil genes -- $t Using medical imaging to understand psychopaths -- $t Insights from my sister's love letters -- $t The connection between Machiavellianism and personality disorders -- $t Slobodan Milosevic : the butcher of the Balkans -- $t Lenses, frames, and how broken brains work -- $t The perfect "borderpath" : Chairman Mao -- $t Evolution and Machiavellianism -- $t Shades of gray -- $t The sun also shines on the wicked.