Vilified by some and venerated by others as the FBI informant largely responsible for the imprisonment of two youths following the 2008 Republican National Convention Darby was once a charismatic activist mythologized by the American Left for his daredevil aid work in New Orleans Ninth Ward in the aftermath of Hurricane Katrina Informant meticulously constructs a portrait of his lifebefore and after the death threatsthrough intimate interviews with Darby and tense reenactments starring the man himself