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.
Public pressure on Terry and the SFPD continues to rise for the shooting death of an unarmed suspect. Hildy tracks down the fugitive in the Normandy Parker murder. Arkin advises Siletti to reconcile with his wife, as she may be the key to winning - or losing - his case.
Disturbing new information about Normandy Parker lengthens the list of suspects in his murder. Siletti, fighting for his future, sabotages the D.A. who replaced him. Terry and Hildy face an ultimatum about their secret romance.
The murder of a prime suspect in the Normandy Parker case seems to prove Terry's conspiracy theory. Siletti's fragile peace with his family is upended by a ruinous civil lawsuit compounding his legal troubles. And Hildy goes on a date in an attempt to move on from Terry.
Terry and Hildy fear they may have lost a prime suspect to his gangster enemies. Terry is left to question his true feelings when Hildy agrees to another date with Burnside. Siletti prepares for the most crucial trial of his career: his own.
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 their roles as partners may prevent their personal happiness.
Terry and Hildy struggle to collect evidence against their number one suspect; Terry tries to repair his relationship with Hildy; an emotional witness threatens Siletti's chances at life on the outside.