1. The System Was Blinking Red

Interviews and chilling archival recordings chronicle the chaos that unfolded during the 9/11 attacks, whose origins can be traced to the 1980s.

2. A Place of Danger

Survivors recount the horrors they endured on 9/11. Immediately after the attacks, George W. Bush begins charting America's aggressive military response.

3. The Dark Side

Learning the hijackers benefitted from gaps in US intelligence, the White House justifies a secret surveillance program and "enhanced interrogation."

4. The Good War

With no cohesive strategy, the war in Afghanistan squanders early successes and backfires, fueling disillusionment, corruption and a Taliban resurgence.