
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.

An investigation into a Marine's murder leads to a surprising discovery; Abby and McGee head south of the border.

Gibbs makes shocking discoveries while investigating a respected colleague's murder.

Gibbs goes to Mexico to confront a drug cartel intent on revenge; Gibbs has to make a devastating decision.

Gibbs finds himself on an emotional journey into his past when he agrees to help the childhood friend of his now-dead daughter.