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 turns out to be harboring a dark secret. Jane starts to see a softer side of her old organization.

When Weller and Jane go missing during an undercover operation, the rest of the team must interrogate two criminals who hold the key to finding them. AUSA Weitz returns with a vendetta against the team.