For many Americans, the most difficult questions about 9/11 were not about politics, military strategy or homeland security. They were questions about God, about evil and about the potential for darkness within religion itself. What was it we saw on Sept. 11? Was it the true face of evil? Was it the face of religion? And where, if one is a believer, was God on that tragic morning? A PBS Frontline special.

Filmmaker Freida Lee Mock explores the life and work of playwright Tony Kushner. Starting in 2001, when Kushner was mounting the production of his play Homebody/Kabul and running through 2004, as he worked on John Kerry's presidential campaign, got married to Mark Harris, worked with Maurice Sendak, and opened the Broadway musical Caroline, or Change.