The team races to stop a corrupt DEA agent from selling stinger missiles to a drug cartel as Weller fights to keep everyone together under the increasing pressures of Jane's rift with the others and the uncomfortable addition of Nas as co-leader.

Nas and Weller navigate their new dynamic as co-leaders during the team's hunt for a museum gala assassin, who turns out to be harboring a dark secret; Jane starts to see a softer side of her old organization.