Homicide Inspectors Terry English and Hildy Mulligan investigate 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 might 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 struggle to collect evidence against their new number one suspect. Terry attempts to repair his relationship with Hildy. The prosecution comes out swinging with an emotional witness who threatens Siletti’s chances at life on the outside.

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.

In this thrilling season finale, Terry and Hildy race to close one of their most complex cases. A new grisly murder hits close to home for the inspectors. Siletti learns his victory in court comes with a substantial price.