
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 an infamous arms dealer is released from prison and bodies start piling up, Torres is forced to face the repercussions of his actions during an undercover operation he worked on years ago.

A woman asks the NCIS team to investigate the death of her husband, a Marine who specialized in K-9 bomb detection; Vance interviews nannies.

NCIS investigates a ring of clever teenage partygoers when a string of break-ins takes place at Marine Base Quantico; while working the case, agent McGee forms a bond with one of the teens.

NCIS investigates the unexpected death of a Navy reservist who was an investigative journalist; Knight and Jimmy's budding romance is put on hold when a vital organ transfer goes fatally wrong.