The book is Little Brother by Cory Doctorow. It’s about what happens when some tech-savvy teenagers are victimized by the national security cult running the USA these days, and the kids’ resulting stand against that cult and the government itself. It’s bracing, intelligent, important stuff, and it reads like a high-quality pulp page-turner.
Little Brother is widely available in bookstores, and of course on Amazon. But Cory has also made it available for free:
Check it out. Read a few chapters, and if you like what you read, grab a paid for copy for yourself or some kid you know or a library nearby.