In his investigation of America's powerful agency, the NSA, Bamford takes readers into its heavily-guarded headquarters, Crypto City. From this fortress, tens of thousands of workers conduct international surveillance, crack codes and influence foreign affairs. Written 20 years after Bamford's first expose on the NSA, The Puzzle Palace, his newest study revisits lingering questions and brings readers into the 21st century. With an afterword on Sept. 11th security lapses.  (SPY06, $16.95)