After NCIS arrives at a Halloween crime scene, Torres recognizes the victim as a friend from federal law enforcement training. Also, Jimmy thinks his lab is haunted by ghosts after objects keep mysteriously moving.

United States Secretary of Defense Wynn Crawford shuts down Gibbs' murder investigation and demands that Special Agents McGee and Torres be arrested for their actions in the case.

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.

After entering cold case DNA into the system, Kasie solves a 30-year-old murder case, but a loophole in the legal system may set the suspect free. Also, McGee visits an elite technology company in Silicon Valley that is offering him a highly paid position.

After NCIS finds a secret government bank account that’s funding a nationwide network of vigilante justice, the team must determine who is acting as judge and jury.