What goes on in the mind of a murderer? What drives an ordinary person to cross the line into the unimaginable? In Neurohorror, researcher José Manuel Frías explores some of the most disturbing criminal biographies in history. From the enigmatic Lizzie Borden to figures like Enriqueta Martí or Henri Désiré Landru, this book brings together real lives marked by violence, deception, and death. Through a fluid and immersive narrative style, the author reconstructs the crimes, contexts, and circumstances surrounding these characters, delving into their decisions, their contradictions, and their most atrocious acts. It is not just about knowing what they did, but about understanding how they came to do it. A collection of stories that reveals the darkest side of human nature... and that demonstrates that, sometimes, reality is more unsettling than any fiction.