Follows a locally born and bred S.W.A.T. lieutenant, Hondo, who is torn between loyalty to the streets and duty to his fellow officers when he's tasked to run a highly-trained unit that's the last stop for solving crimes in Los Angeles.
When a series of home invasions are committed by SWAT imposters in an upscale neighborhood, Hondo and the team suspect the burglarized families are all hiding something. Also, when Deacon and Luca are assigned to protect a visiting professional hockey player who is receiving death threats, his penchant for trouble becomes a complication.
Hondo puts aside his misgivings about Jim Street's recklessness and allows the newbie to go undercover as a broker in a luxury car theft ring to bust a ruthless trafficker. Also, Hondo visits Raymont Harris, the teenager recently shot by a former member of the SWAT team, who is dealing with PTSD.
Gang violence hits close to home for Hondo and his imprisoned friend asks him to shield his son from the aftermath. Luca struggles with his his grief when his grandfather, a S.W.A.T. legend but flawed individual, passes away.
The team's plans to enjoy Christmas vacation with their families and friends are put on hold when a drug cartel's cache of gold bars is stolen; Jessica approaches the police commission president with ideas on how to improve the S.W.A.T. Division.
The job becomes personal for Hondo when a friend is killed during a joint FBI/S.W.A.T. mission to stop a robbery crew. Jessica worries the erratic behavior of the FBI task force leader will endanger the team in the field.
As the team works to de-escalate a hostage situation, the mission takes a dangerous turn, which impacts the team; Jim tires of his romantic entanglements and agrees to let Chris makeover his online dating profile.
Jim Street debates whether or not his mother should live with him upon her release from prison; "Hondo" and the team are assigned to protect a high-profile Russian journalist who is visiting Los Angeles, California U.S.A.
A fake 911 call puts "Hondo" and the team on the hunt to stop bombing attacks; Jim's relationship with his mother jeopardizes his career; Jessica is thrown a curve ball by the president of the police commission.