
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.

NCIS, FBI and MI6 continue the worldwide manhunt for a British spy who is targeting current and former agents.

The team is forced to put in overtime while searching for a suspect presumed dead when working on a case over Christmas.

A former FBI agent pleads with Gibbs to do whatever is necessary to take down drug dealers after his daughter is hospitalized from an opiate overdose; Gibbs is haunted by the personal aspects of the case and his history with vigilante justice.

Ziva surprises Gibbs with a cryptic warning, prompting him to question why she remained underground for years while being presumed dead by family and friends.