Chatter: Uncovering the Echelon Surveillance Network and the Secret World of Global Eavesdropping

How does our government eavesdrop? Whom do they eavesdrop on? And is the interception of communication an effective means of predicting and preventing future attacks? These are some of the questions at the heart of Patrick Radden Keefe's brilliant new book, Chatter.

In the late 1990s, when Keefe was a graduate student in England, he heard stories about an eavesdropping network led by the United States that spanned the planet. The system, known as Echelon, allowed America and its allies to i...