Anthropophagy - humans eating their fellow-humans - creates a curious blend of revulsion and fascination. When the perpetrator is a murderer - most commonly a sadistic serial killer - the crime is not only shocking, but also bewildering. Moira Martingale's comprehensive study, Cannibal Killers: The Impossible Monsters, was originally written in 1993, when the Internet was in its infancy, when few homes had computers and when...