Can you predict killing sprees? What do mass killers have in common? Why do so many of them write manifestos online and what do these tell us? These are some of the questions David J. Krajicek seeks to answer in Mass Killings, on a topic that is becoming increasingly urgent and desperate. In recent decades, mass shootings worldwide have increased in their savagery and frequency. Krajicek shows the commonalities between mass shooters, and describes the psychopathic process that leads these troubled men to commit atrocities. Mass killers feed off each other's words and deeds, and it's crucial to be able to read the signals they give out to prevent future tragedies.