Little Brother is a young adult novel by Cory Doctorow. It follows the story of Marcus Yallow, a tech-savvy teenager who becomes a target of the Department of Homeland Security after a terrorist attack in San Francisco. Marcus and his friends use their hacking skills to fight back against the invasive surveillance and erosion of civil liberties. This fast-paced and thought-provoking book explores themes of government surveillance, privacy, and the power of grassroots activism. Little Brother is a must-read for anyone interested in the intersection of technology and personal freedom.