Running Amok by Paul E. Mullen

Port Arthur 1996. Dunblane 1996. Utya 2011. Christchurch 2019. Lewiston 2023.

What drives someone to commit the unthinkable? In Running Amok, forensic psychiatrist Paul E. Mullen burrows into the minds of mass murderers to learn how and why they become spectres haunting modern communities.

Drawing on decades of experience assessing killers such as the perpetrator of the 1996 Port Arthur massacre in Australia, Mullen examines the key forces that unite them: obsessive rage, personal grievance, fascination with weapons and a quest for infamy often culminating in suicide. Mullen reveals these killers not as incomprehensible monsters, but as deeply disturbed individuals shaped by knowable forces. Crucially, he offers guidance on recognising warning signs and improving threat assessment. He also explores the corrosive role of media sensationalism, which fuels grandiose fantasies and inspires copycat violence.

Running Amok is both a searing investigation into mass murder and a call to action, urging society to confront these dark realities and prevent the next horror.

What drives someone to commit the unthinkable? In Running Amok, forensic psychiatrist Paul E. Mullen burrows into the minds of mass murderers to learn how and why they become spectres haunting modern communities.

About the Author:

Paul E. Mullen is a world authority on lone wolf mass killers and stalking. He is Professor Emeritus at Monash University, and has held prominent posts at the Institute of Psychiatry in London and the Victorian Institute of Forensic Psychiatry in Australia. He has published more than 200 journal articles and co-authored four books on forensic psychiatry, including a leading textbook on stalking that was awarded the American Psychiatric Association’s Guttmacher Prize.

01 Oct 2025
 

Running Amok: Inside the Mind of the Lone Mass Killer by Paul E. Mullen ISBN 9781917569224