When a junkie is murdered in the Tenderloin district, SFPD detectives Terry English and Hildy Mulligan are shocked to discover the case may be related to the city's youngest billionaire, tech genius Erich Blunt. But Terry's ability to focus is troubled as his wife battles stage 4 pancreatic cancer. Just as the inspectors begin closing in on the case, Blunt's beautiful flight attendant is found dead.
As Inspectors Terry English and Hildy Mulligan begin their investigation into the death of Erich Blunt's flight attendant, Cindy Strauss, Terry must also deal with the recent death of his wife and the arrival of his sister-in-law. The investigation takes an unexpected turn when the results of Cindy's autopsy reveal a shocking secret.
Despite the advice of his lawyer, Warren Daniels, Erich Blunt escapes for a drug-fueled weekend with his adoring CTO, Ivana West. Meanwhile, Terry and Hildy must deal with the repercussions of Hildy's officer involved shooting. As Hildy confronts the prospect of losing her job, Terry works to help his partner get out of trouble.
It's six months later, and the whole world is watching as tech genius Erich Blunt is put on trial for the murder of his flight attendant, Cindy Strauss. Meanwhile, Terry decides to start making amends for his behavior after the death of his wife. Hildy begins reconnecting with her ex-husband, Mike, and soon must confront the temptation to rekindle their romance.
Raffi fears Hildy's continued investigation of the grow house murder will blowback on a case of her own. Dustin's defense team enlists the aid of acclaimed attorney Jamie Nelson. When new evidence suggests an inspector was murdered, Terry fears it may be connected to someone within the Hall of Justice.
The pressure ratchets up on Terry and Hildy to discover who's behind the cop-killings. Jamie comes out swinging, making an unexpected move in her defense of Dustin. Navarro reunites with his brother, who has been recently released from prison. Meanwhile, an anonymous tip gives Raffi a potential connect for her case against Suger.
Season three kicks off for Homicide Inspectors Terry English and Hildy Mulligan when an all-star quarterback is murdered in the middle of a crowded club in front of his pop star girlfriend. D.A. Mario Siletti and his wife are involved in a tragic car accident that could end his career and his marriage. And an untimely diagnosis threatens Hildy's future.
As the hunt continues for the prime suspect in the Normandy Parker case, an anonymous tip forces Terry into an officer-involved shooting that sets off public uproar. A desperate Siletti reluctantly hires DUI defense attorney Alfred Arkin but withholds essential trial information. Hildy gets good news for her future, and she and Terry cross a line together.
While the investigation into the murder of Normandy shifts closer to home, a new murder leads Terry and Hildy to revisit an earlier suspect. The trial of Mario Siletti gets underway as the state Attorney General's prosecutor, hell-bent on putting the District Attorney behind bars, unloads the first witnesses against him. Terry and Hildy face the harsh reality that their roles as partners may prevent their personal happiness.
When a promising new clue is uncovered, Terry and Hildy push forward in hopes of finally solving the Normandy Parker conspiracy. Siletti pulls out all the stops in his crusade against the very system he championed as District Attorney. Hildy’s home life continues to spiral downward as one of her own winds up in the interrogation room.