In this program, NOVA chronicles the NSA's role in eavesdropping both before and after 9/11. Drawing on dozens of interviews with agency insiders and probing publicly available sources as well as transcripts of terrorist trials and an FBI chronology of the terrorists' movements, NOVA assembles a detailed picture of events leading up to the 9/11 attacks.

For more information please visit our website - /www.pbs.org/nova/spyfactory/