A report on the 9/11 terrorist attacks and their impact on the Fire Department of New York. Firefighters who were at Ground Zero on that day discuss the tragedy and recall fallen colleagues. Includes interviews with Joe Pfeifer, Chief of Counterterrorism; Sal Cassano, fire Commissioner; Peter Hayden, Chief of Department; Dan Nigro, FDNY Commissioner; John Peruggia, EMS Division Chief; John Sudnik, Chief of Department; Regina Wilson, Jeff Coniglio, Jamie Efthimiades, James McGlynn and Bob Bacon, firefighters who were there that day; Captain Peter Ganci III and Battalion Chief Chris Ganci, sons of the late chief of department Peter Ganci; Josephine Smith, a firefighter whose late father Kevin Smith passed away on 9/11; John Palombo and Tommy Palombo, both firefighters whose father Frank Palombo passed on 9/11; and Mike Florio, a firefighter whose father John Florio passed on 9/11.