Ziva surprises Gibbs with a cryptic warning, prompting him to question why she remained underground for years while being presumed dead by family and friends.
With their lives in danger, Gibbs and Ziva's rogue investigation takes an unexpected turn when a possible terrorist plot is revealed.
After the body of a Marine lieutenant is found hidden under an 18-wheeler, the team tracks the vehicle's previous locations to pinpoint the crime scene and suspect; Sloane encourages the team to sit down and talk about Ziva's recent reappearance.
The team links a bizarre crime scene at Arlington National Cemetery to a string of attacks on homeless veterans; Vance orders McGee, Bishop and Torres to complete hours of evidence garage cleanup for withholding information.
NCIS investigates Marine Cpl. Laney Alimonte after evidence suggests she murdered her neighbor while being treated for insomnia by a hypnotherapist; Gibbs befriends his new neighbors after the 9-year-old's baseball crashes through his window.
After a petty officer's son is found murdered, evidence suggests Kasie's lifelong best friend is guilty.
While investigating a Marine's murder, the NCIS team uncovers a labyrinth of live-streaming spy cameras hidden in the rooms of a Virginia motel.
The NCIS team investigates the murder of a musician in the Navy's most elite band.
The NCIS team investigates a petty officer's murder that was livestreamed on a popular gaming app; Gibbs watches his 11-year-old neighbor when his mom must leave on a last-minute trip.
Gibbs and the team assist Ziva with "the one thing" she said she would need to take care of before returning to see her family.
Gibbs must face the reality of his actions after he assists Ziva with "the one thing" she said she would need to take care of before returning to her family.
The NCIS team investigates an F-18 crash and the subsequent disappearance of the pilot; McGee reluctantly discusses a very personal decision with his teammates.
After a body is found at an unmanned aerial vehicle testing site, the NCIS team must determine if the death was murder or an accident; Palmer carefully interviews medical examiner assistant candidates.
After Torres and Bishop are victims of a hit-and-run, Torres fights for his life in the Intensive Care Unit.
The lead suspect in a murder investigation is a woman that Gibbs' friend met on a dating site; Sloane has a secret admirer on Valentine's Day.
The team tries to piece together how a retired Navy officer obtained a rare and valuable coin.
A Navy officer is murdered the same way his parents were murdered a decade ago; the team stumbles across a storage container filled with dollhouses that display re-creations of murder scenes; the team members agree to clean out their living spaces.
The body of a well-regarded Navy technician is found floating in a lake, which isn't far from where a popular community event takes place; Sloane's daughter makes an unexpected request.
When Kasie and Jimmy are held hostage in a diner after a jewelry store robbery goes awry, they attempt to keep the other customers safe from the thieves.