An experimental Naval aircraft crashes on Oahu, and Jane Tennant and her team must find who is behind it before classified state secrets are exposed.

Kai goes undercover with one of Hawai'i's oldest surf gangs when a petty officer who's trying to help wayward kids find a new path in the Marines is murdered.

A Japanese sailor is killed and evidence links the case to the murder of the victim's girlfriend back in Japan, NCIS must find the murderer before the wrong person is accused and the case triggers a diplomatic crisis.

When a Navy petty officer is murdered, Jane and the team investigate while protecting the victim's friend and colleague.

When an anti-capitalist protestor is murdered, Jane and the team investigate and find themselves caught in a war between eco-activists and a tech billionaire fighting over a piece of land. Also, Jane and Captain Joe go on a date.

The NCIS team investigates a cold case involving WWII-era bones on the 80th anniversary of the Pearl Harbor bombings, and are shocked to learn they belong to a 100-year-old survivor of the attack.

NCIS crosses paths with Whistler's team while investigating a shipping container filled with contraband weapons. Also, Tennant debates arresting Alex's friend's dad, knowing it will cause his friend to move away.

Evidence to put away a drug kingpin is stolen, Lucy goes undercover at an underground poker tournament to find out which high-roller is behind the crime. Lucy's feelings are in turmoil when Whistler's ex-girlfriend arrives in town.

While Tennant investigates Maggie's kidnapping, she learns the shocking truth about her friend's past. She gets help from her team to prove what she found out is true.

Jane Tennant faces interrogation about her friendship with a CIA mole. Her team investigates an ultrasonic attack on a Marine team, the only victims at a crowded beach. Whistler has a new job that brings her into contact with Lucy again.

As Jesse enjoys a day sailing with his daughter, Gracie, pirates suddenly seize their yacht, take all the passengers hostage and attack Jesse, leaving it up to his team to quickly locate and rescue his daughter.

Kai goes undercover as a chef in a local restaurant to gather intel on a notorious criminal kingpin who has a connection to the eatery.

NCIS Agents Nick Torres and Jessica Knight travel to Hawai'i when they learn a key witness in one of their old cases has turned up there with crucial evidence.

NCIS team investigates a shipwreck carrying exotic animals that now threaten the native wildlife on Oahu. Alex sustains a career-ending injury and Kai asks Melanie, a fish and wildlife agent, out on a date.

When a navy seaman is involved in a murder, the NCIS team is called to work the case on their day off. Also, Lucy finds out Whistler turned down a promotion in D.C. to stay in Hawai'i.

Captain Milius returns to Hawai'i for a secret prisoner exchange operation, and brings in Jane to be his personal security escort in the Philippines, where the exchange will take place.