When Hondo’s imprisoned childhood friend asks him to protect his son from gang violence, the favor brings SWAT into contact with a new local crime outfit. Also, when Luca’s grandfather, a SWAT legend, passes away, he struggles with his grief and a painful family secret.

The SWAT team hunts for a band of criminals re-enacting the crimes of the infamous Symbionese Liberation Army. Seeking expertise on the original crime spree in the 1970s, Luca and his father review the files of Luca’s late grandfather who worked for SWAT during the era of the original crimes. Hondo experiences discrimination from a fellow officer during a SWAT training seminar for local law enforcement in Arizona.

When classified information falls into the wrong hands, the team races to stop a dangerous plot targeting former members of the U.S. military; Luca is faced with a challenging choice when a family member suddenly falls ill.