9/11 was perhaps the defining historical event of the postwar era. Broadcast live around the world like horrifying theatre, it was a moment in history imprinted onto people's memories. But what was it like to actually live through, and how easy is it to move on from a day that society wants to go on remembering? Twenty years on, this film brings together 13 ordinary people who were caught in an event they weren't able to fully comprehend at the time and which they are still working through.

• Documentary