Unmasked by Ars Technica investigates the 2011 cyberattack carried out by the hacker collective Anonymous against the security firm HBGary Federal. The attack exposed controversial plans involving surveillance of pro-union groups, targeting of WikiLeaks, and the development of cyber weapons for government use. The book also explores the fallout from the breach, including the resignation of HBGary Federal's CEO and demands for accountability, offering a revealing look into the shadowy realms of hacking, cybersecurity, and power dynamics in the digital age.