The NCIS team continues their search for Gibbs and McGee two months after they went missing fighting rebels in Paraguay; Vance and Torres are summoned to a congressional hearing regarding the fallout from the Paraguay mission.
The team investigates the murder of a Navy lieutenant, whose body is found hidden at a local cemetery; Gibbs and McGee must pass a psychiatric evaluation before officially resuming work.
Torres' partner mysteriously vanishes, and the subsequent investigation leads to new evidence in a decade-old murder; Ducky's friend presents him with a new opportunity during his guest lecture series.
Director Vance welcomes NCIS Special Agent Jacqueline "Jack" Sloane to headquarters; the team investigates the kidnapping of a sailor.
Reeves sees his friend get kidnapped; the prime suspect disappears with confidential military information; an embarrassing photo from McGee's teenage years becomes a popular meme.
A petty officer is found murdered on a golf course; McGee tries to locate a key witness by spending hours on the victim's ham radio; Palmer asks his co-workers to donate to a charity.
Gibbs begins his own investigation when a convicted felon swears he was framed; FBI agent Fornell joins the team.
A person of interest in a bribery and fraud case is found murdered after a runner is led to his body by a strange voice; McGee and Delilah disagree about finding out their baby's sex.
The team tracks an elusive international arms dealer who recently murdered an MI6 officer; Abby races Delilah to the hospital when her labor starts three weeks early.
Gibbs and the team investigate the altercation that caused injuries to Sen. John Phillips' son; Torres and Sloane must protect the senator as they travel from Afghanistan back to the States.
Torres and Bishop go under cover as a criminal couple available for hire during a sting operation tracking illegal drug-running out of the Norfolk civilian marina.
Gibbs and the team investigate when a seemingly happy and successful Navy lieutenant appears to have taken her own life.
McGee and Torres visit the home of a high school student who witnessed a hit and run; Vance's daughter is arrested for shoplifting.
The body of a missing Navy commander is found; Gibbs is ordered to work with a former FBI agent; Bishop and Torres interview convicted investment advisor Albert Hathaway when the victim is linked to his highly publicized trial.
A convicted murderer is given a 48-hour furlough at his former residence in exchange for information about a former cellmate who deceived Gibbs and Fornell.
Gibbs and the team work to clear the name of a retired Marine after cyanide is found in one of the care packages he sent to active-duty Marines.
Gibbs and Ducky see an antique war stick on television, and it could be the missing murder weapon to a 16-year-old cold case.
The NCIS headquarters are evacuated after the team discovers bomb materials on the roof of the squad room; the team reads the first draft of Ducky's book.
Gibbs is granted protective custody of a 10-year-old orphaned refugee when a case reveals she is the target of a violent gang.
NCIS searches for a petty officer who is suspected of assault and escapes when the sheriff transporting him crashes into a lake; Torres works closely with a blind witness who heard vital evidence that is needed to solve the case.
Sara Carter begs Gibbs to investigate her mother's murder; she believes the wrong man was convicted; Abby is awarded a dinner reservation for two to a new five-star restaurant in an igloo and has to decide which co-worker deserves to go with her.
When evidence reveals a team member is a hit man's latest target, the team must search through old case files to determine who is seeking vengeance.
While Gibbs attends the memorial service for a friend who was lost at sea, he discovers that the deceased has been hiding in a fallout shelter after his boat was attacked and he swam to shore.