Introduction -- In search of Machiavelli -- Psychopathy -- Evil genes -- Using medical imaging to understand psychopaths -- Insights from my sister's love letters -- The connection between Machiavellianism and personality disorders -- Slobodan Milosevic : the butcher of the Balkans -- Lenses, frames, and how broken brains work -- The perfect "borderpath" : Chairman Mao -- Evolution and Machiavellianism -- Shades of gray -- The sun also shines on the wicked.