
Naval Criminal Investigative Service Special Agent Leroy Jethro Gibbs leads a group of colorful personalities in investigating crimes -- ranging from murder and espionage to terrorism -- that have evidence connected to Navy and Marine Corps personnel. The team includes MIT graduate Timothy McGee, Ellie Bishop, who specializes in international threat assessment, charismatic and unpredictable Nick Torres, and forensic psychologist Jack Sloane. Dr. Donald "Ducky" Mallard brings his vast experience in forensics into play to help solve cases.

Ziva has a tense reunion with her father, the head of Mossad; Gibbs is forced to make a shocking decision.

Two mercenaries are found dead on Gibbs' boat; Gibbs must consider his former mentor in a new light.

The team helps Vance face his demons while uncovering a complex relationship with a killer that endangers his family.

The team's investigation into a lieutenant's death is connected to a citywide blackout.