Interviews with members of the cast from season 4.

A brief look at the history of "Homicide: Life on the Street", one of the best shows on television and its ratings history as well as some of the people on the show, as well as behind the camera. The primary focus of this PBS documentary is the "Subway" episode which aired on December 5, 1997 on NBC. This two-hour documentary follows the "Subway" episode from conception to award nominations.

The squad's former lieutenant, Al Giardello, is running for mayor and is close to victory when he is shot during a campaign speech. The assassination attempt inspires the arrival of the entire unit, past and present, in a joint effort to bring down the gunman. Every regular from the series—including two dead characters who make their appearance in a startling, non-flashback scene near the film's end—returns for this final chapter in the series' seven-year-long story.