When he ditches school one Friday morning, 17-year-old Marcus is hoping to get a head start on the Harajuku Fun Madness clue. But after a terrorist attack in San Francisco, he and his friends are swept up in the extralegal world of the Department of Homeland Security. After questioning that includes physical torture and psychological stress, Marcus is released, a marked man in a much darker San Francisco: a city of constant surveillance and civil-liberty forfeiture. Encouraging hackers from around the city, Marcus fights against the system while falling for one hacker in particular. Doctorow rapidly confronts issues, from civil liberties to cryptology to social justice. While his political bias is obvious, he does try to depict opposing viewpoints fairly. Those who have embraced the legislative developments since 9/11 may be horrified by his harsh take on Homeland Security, Guantánamo Bay, and the PATRIOT Act. Politics aside, Marcus is a wonderfully developed character: hyperaware of his surroundings, trying to redress past wrongs, and rebelling against authority. Teen espionage fans will appreciate the numerous gadgets made from everyday materials. One afterword by a noted cryptologist and another from an infamous hacker further reflect Doctorow's principles, and a bibliography has resources for teens interested in intellectual freedom, information access, and technology enhancements. Curious readers will also be able to visit BoingBoing, an eclectic group blog that Doctorow coedits. Raising pertinent questions and fostering discussion, this techno-thriller is an outstanding first purchase.

Cory Doctorow