He was the first of a new breed of American celebrity – the handsome, debonair and super intelligent mass murderer. His legend, fueled by his own insatiable appetite for exaggeration, would turn him into a monster, ‘the arch-fiend of the age’ and the ‘greatest criminal of this expiring century’. His “Murder Castle”, situated at the heart of the world’s greatest exhibition, was reputedly the scene of unspeakable horrors.