
Two great books to start with:
- The Science of Evil: https://www.amazon.com/Science-Evil-Empathy-Origins-Cruelty/...
- The Psychopath Whisperer: The Science of Those Without Conscious: https://www.amazon.com/Psychopath-Whisperer-Science-Without-...
Well, it's 3 - but it is a hard question.
