Spike Lee commemorates the people of New Orleans with a four-hour epic documentary that not only recounts the events of late August 2005 but asks why they unfolded the way they did in the first place. Weaving interviews with news footage and amateur video, Lee uses the film to give meaningful voice to the people who were left behind. With a detached and unsentimental eye, he delivers a poignant account of a major moment in recent U.S. history.