As NCIS investigates a dangerous connection between the Nexus cartel and Parker's longtime nemesis, mob boss Carla Marino, the team uncovers a high-stakes plot involving stolen nuclear material.

McGee's career and credibility are on the line when he investigates the Deputy Director for corruption.

When a trio of combat vets are found murdered in a D.C. motel room, NCIS tracks down a suspect who refuses to talk to anyone but Sam Hanna.

After NCIS captures the hitman known as "The Poet," the team races to uncover who ordered the assassination of a Navy chief.