In 2013, Edward Snowden shocked the world when he broke with the American intelligence establishment and revealed that the United States government was secretly pursuing the means to collect every single phone call, text message, and email. The result would be an unprecedented system of mass surveillance with the ability to pry into the private lives of every person on earth. Six years later, the man who risked everything to expose the US government's system of mass surveillance reveals to a new generation how he helped build that system, what motivated him to try to bring it down, and how kids can protect their privacy in this digital age of indiscriminate data collection