Jimmy is torn between family and work after his father-in-law, Ed, asks him to tamper with evidence from NCIS’ current murder investigation. Also, Ed’s poker buddy, Anthony DiNozzo, Sr., offers to help with the case.

The NCIS team investigates the murder of a Marine Sergeant in the States who was hailed as a war hero for his efforts overseas. Also, Gibbs turns to Doctor Grace Confalone for advice after he uncharacteristically unravels and abandons his team at a crime scene investigation.

NCIS investigates Marine Corporal Laney Alimonte after evidence suggests she murdered her neighbor while being treated for insomnia by a hypnotherapist. Also, Gibbs befriends his new neighbors after the 9-year-old’s baseball crashes through his window.

While investigating the suicide of a retired Navy officer who left a rare, valuable - and possibly stolen - coin to the National Museum of the Navy, the team imagines themselves in his life story in order to piece together how the coin ended up in his possession.

The discovery of two dead bodies leads the NCIS team into the wild world of modern-day treasure hunting. Also, Gibbs and Fornell get deeper into their search for the opioid kingpin.

Following a tip about smuggled weapons, Bishop and Torres engage in a shootout in a former sheriff's residence that's now a historical site, only to find themselves locked in abandoned jail cells there.

NCIS uncovers a secret dogfighting ring, which leads to an unexpected move by one of the team members.

NCIS tracks a stolen laptop to the uncle of a young boy, Phineas, Gibbs’ former neighbor.

While pursuing a dangerous arms dealer, the team is shocked when Bishop is implicated in an old NSA leak while Gibbs and Marcie realize the killer they've been tracking may be onto them.

The NCIS team investigates the death of a Navy officer whose body suddenly explodes before Jimmy can examine it.

While investigating the death of an intruder at Quantico, Jimmy and Kasie are exposed to a deadly biotoxin; the NCIS team calls on Dr. Carol Wilson for help as they race to find the antidote; Torres tries to distract Jimmy's daughter.

When a dead body is found at an ancient burial site that is thought to be cursed, the team tries to determine the motive and the symbolism behind the crime. Also, as Torres continues therapy with Dr. Grace, he discovers that their lives are in danger.

Parker grapples with his emotions when a conman from his past turns up as a prime suspect in the murder of a navy officer transporting millions of dollars’ worth of opioids.

Agent Torres finds himself in prison as the team tries to stop an impending terror attack on U.S. soil.

The NCIS team must help Torres when he puts his future at stake by confronting the man who tormented his family when he was a child.