Sous le choc du meurtre de son père, Alden Parker ne recule devant rien pour traquer la femme qu'il tient pour responsable, la cheffe de la mafia Carla Marino, mettant en péril sa carrière et la sécurité de son équipe.

Alors que Parker poursuit sa vendetta contre Carla Marino, l'équipe doit composer avec son décès présumé et une opération officieuse à l'étranger. Sa soeur Harriet, vice-amirale, se retrouve face à un dilemme moral et stratégique, tandis que le NCIS agit dans l'ombre pour empêcher la situation d'échapper à tout contrôle.

La mort d'un sous-officier liée à un chantage sexuel mène les agents à travailler avec l'équipe de nuit et l'agent Dale Sawyer, qui travaillent sur des affaires de chantage similaires. Torres est exposé à un danger au cours des investigations, tandis que Knight se voit proposer une formation d'élite au NCIS.

The team investigates a U.S. Marine who is believed to have kidnapped the wife of one of the most powerful men at the Department of Justice.

A prison break by an inmate compels the team to reopen the case of a Naval officer's death that was originally investigated by Gibbs and Franks in the '90s.

When McGee is kidnapped while promoting his latest book in the "Deep Six" crime series, the team investigates his self-professed "#1 fan."

A kidnapped teen leads the team to a Navy SEAL who survived captivity by the Taliban but may have committed murder after returning home.

When a man is shot by the Secret Service outside the vice president's official residence, NCIS is aided in the case by a new member of the team.

McGee and Torres try to recover a stolen truck filled with toys for the Navy's annual Christmas drive while the truth about Parker's mother is finally revealed.

On her first NCIS: Elite mission, Knight is ordered to hunt down Eleanor Bishop after she's designated a wanted cyber-terrorist. Bishop turns to Torres for help.

When a desperate man barricades himself inside an ammo warehouse, Knight is the only negotiator he'll talk to, claiming she once saved him before.

A murdered drone pilot leads the team to a missing woman from McGee's past. As the case deepens, McGee realizes her reappearance could unravel more than an investigation.

When the son of a Marine that Gibbs once helped comes to NCIS in desperation, the fractured team reunites off the books. But chasing justice without a badge may cost them more than their careers.

Navy Week turns electric when a stolen squad car flips and reveals a sailor stabbed in the trunk. As D.C. spirals into chaos, the team chases a killer while carrying the weight of recent events.

A murder aboard a museum ship becomes a cryptic treasure hunt when a dying Navy captain leaves a final clue. To solve it, the team must decode what was worth killing - and dying - for.

A Navy lieutenant resurfaces a year after her plane vanished with a story that doesn't quite add up. As the team peels back the mystery of a crash that was anything but accidental, every answer sparks a new twist.

With most of NCIS away and the mainframe shut down for a midnight upgrade, Kasie and a skeleton crew are left in a darkened building when someone begins hunting from inside. What starts as a routine reboot becomes a high-stakes game of cat and mouse.

The team races to help one of their own who has been framed for murder and caught in a widening conspiracy that could compromise national security.

As a secret immunity deal threatens to let a man walk free, Parker fights to keep the case alive. But when his estranged sister suddenly appears - and buried family wounds resurface - the battle for justice becomes deeply personal.

One year after a deadly coffee shop bombing, a new explosion proves the attack wasn't the work of a lone wolf - a case that forces the team to confront legacy and loyalty, on the 23rd season finale.