Hondo and the SWAT team are forced to work over their Christmas vacation when a drug cartel is out for blood after their cache of gold bars is stolen. Also, Jessica draws the attention of Michael Plank, president of the Police Commission, when she approaches him with her ideas on how to improve the SWAT division.

Hondo confronts his long-held resentment towards his ailing father, Daniel Harrelson, Sr., when he and his sister, Briana, try to convince their dad he’s no longer well enough to live alone. Also, when the SWAT team works as patrol officers for a day, Chris is partnered with Mumford, who intends to make her a surprising offer.

Hondo suspects an ulterior motive when Nina's estranged husband, US Marshal Eric Wells, requests the S.W.A.T. team’s help with apprehending a fugitive who is robbing drug cargo shipments. Jessica is forced to implement departmental budget cuts. Street makes a heartbreaking discovery about his mother.

The abduction of Luca and Street’s neighbor sends the SWAT team in pursuit of a home invasion crew targeting domestic workers to gain entry into upscale homes. Also, the SWAT division prepares to help Mumford mark a major career milestone.

The SWAT team’s task to provide security for a warlord is threatened by assassins determined to take him out before he’s extradited by the International Criminal Court. Also, Hondo’s father, Daniel Sr., tries to make amends to his mother, Charice, Street’s foster brother, Nate, asks for his help with a corrupt boss and Deacon reluctantly explores therapy for his daughter, Lila.

Deacon’s second job working private security at a high-profile boxing match places the SWAT team in the middle of a kidnapping case when a prize fighter’s wife is abducted. Also, Hondo’s young charge, Darryl, becomes frustrated with his lack of paternal rights regarding his infant son, and Tan prepares to introduce his critical mother to his girlfriend, Bonnie.