Gibbs is assigned the role of acting director while the team searches worldwide for Director Vance's whereabouts.
A Navy lieutenant is found murdered in his hot tub; the team interviews families in the victim's peculiar neighborhood; Torres must face the consequences after a volatile night out with Palmer.
An agent is starstruck after the team investigates an explosion outside the home of a Navy SEAL and his wife, a popular reality TV star.
Gibbs' quiet vacation at his remote cabin is interrupted by a call from NCIS asking for his help to locate a robber hiding in the woods near him.
After a 50-year-old tape recording left by a murder victim is found, the team tries to exonerate the Marine serving a life sentence for the crime.
After NCIS arrives at a Halloween crime scene, Torres recognizes the victim as a friend from federal law enforcement training; Jimmy thinks his lab is haunted by ghosts after objects keep mysteriously moving.
A street artist's mural is stolen, and the investigation leads to a conspiracy regarding a Navy contractor and the safety of ocean mammals; Bishop shares a special connection with the street artist.
McGee and Bishop travel to Afghanistan after a murder case in the states is linked to a string of soldiers killed by friendly fire overseas
The team begins an undercover stakeout when their lead suspect in an old unsolved case is released from prison.
The team's holiday plans are put on hold when a murder investigation leads to the discovery of a newborn baby who has no identification and no apparent ties to a family.
The secretary of defense shuts down Gibbs' murder investigation and demands that McGee and Torres be arrested for their actions in the case.
An old family friend pleads with Gibbs to join him on a road trip to search for a missing military ID bracelet; a Navy lieutenant in NCIS protective custody is poisoned by an infamous drug dealer.
McGee reluctantly visits his high school after the unique computer password he used as a teenager is linked to the murder of a department of defense contractor
The NCIS team investigates a man overboard fatality from a Navy destroyer at sea; Torres is frustrated with Vance's assignment to mentor three high school students.
Jimmy is torn between family and work after his father-in-law asks him to tamper with evidence in a current murder investigation; Ed's poker buddy offers to help with the case.
Director Vance is notified by the Pentagon that the nuclear submarine Gibbs and Bishop are aboard to conduct a murder investigation has gone radio silent.
Torres relies on his team's investigative skills after he wakes up on a dilapidated fishing boat and is covered in blood and unable to remember the last 12 hours.
Following an active shooter lockdown at a naval hospital, the team searches for a suspect who fled the scene; someone from Sloane's past is a key witness in the case.
After human remains are discovered at a construction site, NCIS investigates the murder of a Marine major believed to have been killed in the 9/11 attack on the Pentagon.