San Francisco Police Department Detectives Terry English and Hildy Mulligan are quickly thrust into the middle of a brutal onslaught. San Francisco's finest must work quickly to put an end to the threat.

Tensions mount as the manhunt 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.

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.

Terry and Hildy head to Mexico when truths emerge about Navarro. Meanwhile, a fuming Suger prepares for war, and unforeseen developments mark Raffi's investigation into Suger.

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; Raffi's loyalty is questioned; Suger contemplates the future of Potrero; the stress of the trial takes a toll on Jamie.

While Jamie deals with the fallout from her tirade, witnesses begin to take the stand in the case against Dustin; Hildy makes a vow when her family is threatened.

Terry and Hildy take a high-ranking officer into custody; Suger faces a new threat to Potrero; Molk uncovers unsettling information about a potential prostitution ring.

Terry and Hildy race to close in on a murder suspect; Fatty B lobbies to take Potrero in a new direction; a verdict is reached in Dustin's trial.

A murder case is taken a close look at from the the crime being committed and then through the investigation, arrest and actual trial.

Terry English and Hildy Mulligan investigate the death of Erich Blunt's flight attendant, Cindy Strauss. Terry also attempts to deal with the recent death of his wife and the sudden arrival of her sister.

The team investigate the case of Cindy Strauss. Hildy meets up with a young witness who is concerned for his mothers safety.

Erich Blunt dos not listen to his lawyer's advice and leaves for a drug-fueled weekend. Terry and Hildy have to try and deal with the repercussions of Hildy's officer involved shooting.

Erich Blunt decides to take a lie-detector test in an effort to change the public's perception about him. Some problems surround a past suspect's alibi, which could ruin Hildy and Terry's case against Blunt.

Six months have now passed and Erich Blunt is on trial for the murder of Cindy Strauss. Terry comes to a decision to try and atone for his behavior.

An important witness is found dead potentially ruining the prosecution's case. Erich Blunt's high-profile attorney attempts to prove his client's innocence.

Erich Blunt's trial comes to a dramatic conclusion. Warren Daniels thinks about calling Blunt to the stand. Terry believes that a previous investigation had some significant holes in it.

The department looks into the death of a drug-addicted socialite and her husband. Terry and Hildy discover the witnesses in the Kevin Neyers case.

Terry and Hildy investigate the Kevin Neyers murder and discover some shocking secrets.