Sebastian is placed on administrative leave after his response in a foot chase to apprehend a high-value fugitive is questioned by the FBI. Meanwhile, Pride and the team continue to track the target and try to clear Sebastian’s name.

A clinical trial of brain implants in veterans is hacked, and Patton must work alongside his ex-wife who spearheads the project.

Percy and Lasalle go undercover at a high-stakes, underground poker game after the organizer targets players with access to a naval research laboratory. Also, Laurel Pride visits her dad during spring break to discuss options after her upcoming graduation.

After a petty officer is found murdered under a shrimping boat, the NCIS investigation uncovers a conspiracy in the tight-knit local fishing community. Also, Lasalle awaits the final results of the tax fraud investigation into his family’s company.

The NCIS team investigates the murder of Patton's friend, a former Navy Seal gunned down in a drive-by shooting while Patton helplessly watched.

Navy Lieutenant Max Landry asks the New Orleans field office for help when he suspects his girlfriend is a spy. Also, Lasalle faces another devastating dead end as he searches for his brother’s last known whereabouts.

Racial tensions rise in New Orleans when a white NOPD officer shoots a black Navy officer he believed was armed in the middle of a busy street party.

As NCIS investigates a suspicious death and the missing key piece of evidence is a top secret, high tech battery, Pride and the team realize there could be deadly consequences if it falls into the wrong hands.

When a torpedo hits a fishing trawler at sea, the entire Gulf Coast is in jeopardy as Pride and NCIS race to find the submarine before it can strike again.