At a Halloween crime scene, Torres recognizes the NCIS victim as a former friend from federal law enforcement training, and Jimmy thinks his lab may be haunted!
After the lead suspect of an unsolved high-profile burglary case is released from prison, the team resumes their investigation with an undercover stakeout.
The team's holiday plans are put on hold after the murder investigation of a Navy veteran includes the discovery of a newborn baby with no identification.
After a malnourished and confused 9-year-old is found hiding in a storage unit, the team reopens an old missing persons case that Special Agent Ziva David had a personal interest in.
McGee reluctantly visits his former high school after the unique computer password he used as a teenager is linked to the murder of a department of defense contractor.
The team investigates the murder of a Marine Major believed to have been killed in the 9/11 attack on the Pentagon after human remains are discovered at a construction site.
Kasie solves a 30-year-old murder case, but a loophole in the legal system may set the suspect free; McGee visits an elite technology company that is offering him a highly paid position.
After the team finds a secret government bank account that's funding a nationwide network of vigilante justice, they must determine who is acting as judge and jury.
The team investigates the murder of Marine Gunnery Sergeant Richard Wilson who was hailed as a war hero for his efforts overseas; Gibbs turns to Dr. Confalone for advice after uncharacteristically abandoning the team at a crime scene.
Fornell pleads with Gibbs to do whatever is necessary to take down drug dealers in the area after his daughter is hospitalized from a drug overdose; Gibbs is haunted by aspects of the case.
