
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.

When the team finds an 8-year-old girl hiding alone in her apartment and her Marine mother missing, they discover the shy witness is hiding a surprising skill that just might crack the case wide open.

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.