Little Brother is a novel by Cory Doctorow, published by Tor Books. It was released on April 29, 2008. The novel is about several teenagers in San Francisco who, in the aftermath of a terrorist attack on the San Francisco-Oakland Bay Bridge and BART system, defend themselves against what they see as the Department of Homeland Security's attacks on the Bill of Rights. The novel is also available for free, on the author's website, as a Creative Commons download.