Mass-murderers, serial killers, spree killers, homicidal rapists, cannibals and other human predators; 20th century history is poxed with the atrocious, apparently motiveless acts of violence and mayhem perpetrated by these psychopathic outsiders. As the century progressed, cinema and TV played an increasingly important role in the enormous influence of the mass-murder phenomenon on contemporary popular culture. Bad Blood also reveals how life imitates art, examing those allegedly inspired to murder by exposure to violent movies.