The body of a long-dead murder victim is uncovered along with Lt. Provenza’s business card, setting off the squad’s search for his identity and killer. When the bullet is traced to a gang weapon that had been turned into the LAPD 15 years prior, Deputy Chief Johnson is forced to contend with political activist Father Jack.

When a reformed gang member is murdered, the case takes the team back to a familiar neighborhood where they find themselves unwelcomed. Brenda must figure out a way to solve what appears to have been a missed-mark murder and bring peace to an unstable community.