After decades of pursuing mobsters and drug kingpins, the FBI is struggling to broaden its mission in the aftermath of September 11 attacks. Now, enter the inner sanctum today's FBI with unprecedented access granted to National Geographic. Witness the Bureau's top-secret Strategic Information & Operations Center (SIOC) at work. See rare footage of the FBI in action around the world and hear from special agents as they share their personal struggles, hopes and fears in the face of danger. Explore the history of the FBI, from the early days of J. Edgar Hoover's legendary G-men, to the Robert Hanssen spy case and the unique challenges of our modern, high-tech era. Narrated by Dennis Haysbert, star of the TV show "24."