Cyberterrorism conjures fear. Barry Collin prophesied it would mean 'hacking with a body count' when he coined the term in the 1980s. 'Tomorrow's terrorist may be able to do more damage with a keyboard than with a bomb,' the US National Research Council assessed. By 2012, US Defence Secretary Leon Panetta warned that 'a destructive cyber-terrorist attack could virtually paralyse the nation'. His was the latest in decades of government warnings of impending catastrophe. Yet the evidence for such assessments was minimal; terrorist hackers were almost non-existent. Now, a new generation of extremists are coming of age during an accelerating technological revolution; the calamitous fears once rooted solely in science fiction can no longer be as readily dismissed. This book grounds cyberterrorism in evidence, separating alarmist narratives from sombre reality. It chronicles cyberterrorism's evolution, examining hacking operations and those who sit behind the keyboard. It documents how hacking amplifies propaganda, industrialises espionage, and enables sabotage, before assessing the possibility of lethal cyber capability acquisition. Finally, Craig Jarvis explores whether AI will elevate terrorist hacking, intensifying their attempts to influence and destabilise societies.