The Big Book of Serial Killers

His approach combines history and psychology, but I'm curious about what motivated this specific focus. Did he want to explore the criminal mind or shed light on a darker history?

The way real crimes are presented with such detail makes it unsettling but also feels like a form of true crime storytelling. How did others react emotionally to the book's tone?

Given the sensitive nature of the subject, I wonder how much research and fact-checking went into these profiles. Are there sources or references provided?