When a former high-ranking NYPD officer becomes the first female Chief of Police for Los Angeles, she uses her unflinching honesty and hardball tactics to navigate the social, political and national security issues that converge with enforcing the law.

Tommy works to keep her officers in line when one of their own turns up dead, and some want to take extreme measures to find the perpetrator. Also, Mayor Buddy Gray and Deputy Mayor Doug Dudik are concerned about what damaging information Arturo Lopez, a recently arrested acquaintance of Buddy's, may have on him.

Mayor Buddy Gray asks Tommy to personally oversee the investigation when a Hollywood producer is attacked during a party at his home by a woman who claims he tried to sexually assault her first. Also, Tommy prepares for the LAPD recertification process to demonstrate her fitness for her position.

Tommy must decide how to deploy the LAPD's resources when a climate change protest brings riots and a bomb threat at the same time as a mudslide shuts down a major freeway.

When a concert promoter who is accused of defrauding his customers and vendors takes hostages in a restaurant, Tommy sends Cooper and Diaz to manage the situation until she can arrive. Tommy must navigate the politics of the L.A. City Council when two members refuse to sign on to her new budget proposal.

Mayor Gray puts added pressure on Tommy to quickly solve a high-profile kidnapping when a baby is taken from a prominent local businessman, capturing the attention of the citizens of L.A.

Tommy faces a political powder keg when racial tension arises between the LAPD and the African American community, following the cuddle of a notable community activist. While the victim's passing initially looks to be a gang-related hit connected to his past, his passing soon seems linked to a local dispute over highly coveted real estate.

Tommy and the LAPD race to find an online "swatter", a criminal who makes fake 911 calls; as Tommy deploys the department's full resources to the search, the perpetrator threatens to reveal private information about members of the police force.

Tommy tries to help Norah Fayed, a young woman who intentionally gets arrested to buy time for her political asylum request to be approved, and prevent her parents from forcing her to return home abroad. Also, a reporter friend of Blake's asks her for internal information potentially connected to the prison cuddle of Mayor Gray's former campaign donor.

Tommy is accused of professional impropriety when her relationship with sports agent Kiley Mills intersects with the LAPD's arrest of a local sports phenom found possessing an illegal firearm. Also, Blake's search into the disappearance of a reporter who asked her for a favor uncovers a connection to the city medical examiner's office.

Tommy launches an informal investigation into a possible LAPD and city government-related conspiracy just as she prepares to fight for her job in front of an ethics committee.

Tommy and her inner circle fight back against an LAPD and city government conspiracy to have her removed as police chief.