The aftermath of 9/11 has left the firefighters of the NYFD traumatized, and no one more so than Tommy Gavin. Recently separated from his wife and their three kids, Tommy drifts between sorrow and anger as he tries to shake the recurring nightmares of his fallen comrades, especially his late cousin, Jimmy Keefe. Working alongside veterans like Lt. “Lou” Shea, Franco Rivera and Sean Garrity, and rookie Mike Lombardi, Tommy battles alcohol and drugs as he struggles to remain first and foremost a New York City firefighter.