"Little Brother" is a young adult novel by Cory Doctorow that explores themes of surveillance, privacy, and civil liberties. The story follows a teenage boy named Marcus Yallow, who becomes a target of the government after a terrorist attack in San Francisco. As he navigates a world filled with increased security measures, Marcus uses his tech skills to fight back against oppressive systems. The novel highlights the importance of freedom and the impact of technology on society. It encourages readers to think critically about their rights and the balance between safety and personal privacy in a digital age.