While Hetty is attending a Senate hearing in D.C., the investigation of a murdered Marine Lance Corporal leads the NCIS team to stolen anti-tank missiles and a dangerous militia group.

Suspicious of an undercover venture involving a deal between corrupt cops and military personnel, Callen and Sam try to expose the illegal operation by posing as California highway patrol officers.

When a vehicle transporting Jada Khaled is ambushed, NCIS must track down the culprit to save her and their case. Meanwhile, Sam is forced to confront Jada for the first time since returning from Sudan.

The NCIS: LA team continues their investigation behind the death of a CIA agent that leads to a dangerous ring of Russian super agents. In a race against time, Hanna risks having a secret exposed.

Eric witnesses his friend, a computer systems expert, being attacked by people who want information that could redirect a missile; Kensi runs into a familiar face in Afghanistan.

After a former Department of Defense employee reveals government secrets to a cult, The Church of the Unlocked Mind, Kensi and Deeks go undercover in order to protect him. Meanwhile, the team must prevent the church from selling the secrets to a Chinese spy.

Hetty goes rogue, leaving the NCIS team completely in the dark, and the mole kidnaps one of the agents.

When a Navy lieutenant and his grandfather are kidnapped from a retirement home, the team's investigation leads them to a con artist couple and the hunt for a rare coin; Callen meanwhile has to deal with his father's actions when he kidnaps the father of his grandson (and Callen's nephew).