This book is one of a handful to be written about the National Security Agency. Focusing on the time period from the Cold War to the present, Bamford uses interviews and documents, many recently declassified, to paint a picture of the infamous "No Such Agency." Bamford reveals much about the secretive NSA, including the agency's potential to spy on Americans, its worldwide eavesdropping program called Project Echelon where the NSA has secretly monitored private communications across the globe including e-mail, faxes, telephone conversations and data transfers, a proposed plan by the Joint Chiefs of Staff to launch a wave of terrorist attacks against the U.S. and falsely blame Castro (called Operation Northwoods) and its involvement with the USS Liberty, a vessel attacked by Israel during the Six-Day War. Body of Secrets updates the author's first book on the NSA, Puzzle Palace, one of the first books to look at the National Security Agency. Bamford extensively used documents he FOIed to write Puzzle Palace; he uses the same strategy to research Body of Secrets.