A single murder case is dissected from the committing of the crime through to the investigation, arrest and trial.
Cast:Taye Diggs , Kathleen Robertson , Ian Anthony Dale , Raphael Sbarge , Lombardo Boyar , Currie Graham , Mimi Kirkland , Jamie McShane , Camille Balsamo , Laila Robins , Emmanuelle Chriqui , A.J. Buckley , Mo McRae , John Cothran , Mateus Ward , Richard Schiff , James Cromwell , Corey Reynolds
SFPD Detectives Terry English and Hildy Mulligan are quickly thrust into the middle of a brutal onslaught as two students open fire on a school bus in the middle of the city. San Francisco's finest must work quickly in order to put an end to one of the deadliest shootings in recent history.
Tensions mount as the manhunt for the missing shooter proves to be more difficult than expected. Terry is promoted to acting lieutenant, which he soon discovers comes with responsibilities more taxing than he anticipated.
As the city reels, newly appointed D.A. Mario Siletti promises justice. Meanwhile, the body of a young Chinese gang member found in an urban grow house leads Hildy into the dangerous world of drugs and gang politics.
Raffi fears Hildy's continued investigation of the grow house murder will blowback on a case of her own.
With evidence that Det. Kaleb Peat's death was a murder made to look like a suicide, Hildy and Terry come believe his death and that of Walt Martin may have been cop on cop killings. Terry doesn't tell Lt. Koto all that he knows about the case as he and Hildy set out to clear as many of their colleagues as possible. Hildy starts with her brother Jimmy, who isn't very cooperative and doesn't have an alibi. Alyssa drops into see Molk for no apparent reason. Suger tries to make peace with the Chinese gang and it leads to a jailhouse killing. Dustin Maker meanwhile is transferred to prison but surprises his lawyers with his response after being told the prosecution seek the death penalty.
Terry and Hildy find themselves investigating people within their own department. Jamie digs into Dustin's past in an effort to better understand his actions. Meanwhile, Suger searches for answers as someone close to him disappears, then makes a shocking discovery.
The truth about Navarro leads Terry and Hildy to Mexico, as an angry Suger prepares for war. Jamie's casework takes her to Pleasantville, and a particularly painful event from Dustin's childhood. Raffi's investigation into Suger takes an unexpected turn.
Junior reveals new details which may finally give Hildy and Terry the upper hand in their investigation, while the Trial of Dustin Maker begins with opening statements. Meanwhile, an unlikely source provides Suger with startling new information regarding his sister.
Terry and Hildy's investigation is dealt a lethal setback, forcing them to close their case. Raffi's loyalty comes into question, while a cautious Suger contemplates the future of Potrero. The stress of the trial takes a dramatic toll on Jamie's personal life.
Witnesses take the stand in the case against Dustin. Meanwhile, Jamie faces fallout from her tirade, and threats are made against Hildy's family.
Terry and Hildy take a high-ranking officer into custody, while Suger faces a new and unexpected threat to Potrero. Meanwhile, Molk uncovers unsettling information about a potential prostitution ring.
In the season finale, Terry and Hildy are gloves-off as they race to close in on a murder suspect, while Fatty B lobbies to take Potrero in a new direction. The Trial of Dustin Maker reaches a climactic verdict.