A terrorist attack on San Francisco brings the Department of Homeland Security to the city. Four teens are wrongfully detained and only three of them are released. This compels one of their number, Marcus Yallow, to wage a cyber war on the DHS.
The novels considers what freedoms people are willing to sacrifice in the name of national security, and of course this varies widely from person to person.
It's a tense YA thriller with a strong political message that I found compelling and fascinating. Reading the sequel first didn't spoil the story, thankfully.