The SWAT team works to stop a serial bomber that is using drones as detonation devices; just as Hondo settles into legal guardianship of Darryl, his home life becomes more complicated when his estranged father unexpectedly moves in.
The mayor tasks Lt. Lynch with enacting a departmental review of the squad right as they pursue the unstable and dangerous fugitive leader of an infamous doomsday cult; Luca asks the team to invest in his new passion project, a Guatemalan food truck.
Members of the team bump heads with Lt. Lynch when she signs them up for an off-book, undercover operation to take down a local gang that is printing counterfeit money.
Deacon's family gets caught in the crosshairs of a drug cartel when the team aims to bring down its leader; Hondo receives troubling news regarding his father; Tan is forced to go before an internal review board due to his girlfriend's indiscretion.
A Los Angeles S.W.A.T. lieutenant balances loyalty to the job and to the streets where he grew up.
The Harrelsons engage in a tense family reunion when Hondo's older sister begrudgingly arrives to see their sick father for the first time in decades; the team searches for an abducted human rights activist; Luca's food truck business hits a snag.
Thieves are on the run with a high-tech thermal lance that can cut through almost anything; to find the thieves, the team works to identify their target; Chris confronts an imbalance in her relationship with Kira and Ty.