Manchester Evening News 'I've spoken to 10 of history's most evil mass killers – they all shared one trait'
Professor Paul E. Mullen has spent time with some of the world's most notorious mass killers and below he offers a unique insight into what the murderers were like
Professor Paul E. Mullen has spent time with some of the world's most notorious mass killers and below he offers a unique insight into what the murderers were like