Daniel "Hondo" Harrelson, a Los Angeles S.W.A.T. lieutenant, is assigned to lead a highly skilled unit in the community where he grew up. Torn between loyalty to the streets, where the cops are sometimes the enemy, and allegiance to his brothers in blue, he strategically straddles the two worlds. Hondo encourages his team to rely on communication and respect over force and aggression, but when a crisis erupts, these unflinching men and women are prepared to put their tactical training to the test.
Hondo and the team join forces with the FBI on a manhunt to find a militia group planning a domestic terror attack; Jessica's new police initiatives move forward; she braces herself for the negative impact those initiatives could have.
Hondo teams up with an old DEA friend to unmask the secret leader of a drug smuggling ring; Jessica begins implementing her new law enforcement community initiatives.
The SWAT team tries to rescue civilian hostages during a prison riot; Hondo suspects an ulterior motive behind the uprising; Deacon's wife stops by the headquarters to celebrate Deacon's 10th anniversary with the SWAT division.
When a misconduct complaint filed against Hondo gets him taken off active duty, Deacon steps up to lead the team in finding a robbery crew that is hitting marijuana dispensaries.
The team must work during Christmas vacation when a drug cartel's cache of gold bars is stolen; Jessica approaches the president of the police commission with her ideas on how to improve the S.W.A.T. division.