Director Vance assigns a rookie agent to aid the team in their investigation into a deadly bank robbery; Gibbs does not feel that he can trust his own judgment.
Frank and Garrett hope the city will run better if Mayor Chase can work better with others; Danny and Baez look for a criminal who threatens police officers.
Danny and Baez pursue a drug dealer who could be linked to the deaths of two models; Eddie and Jamie investigate the mastermind who committed a robbery.
Sean Reagan investigates the identity of someone whom he matched with from a DNA network; a woman beseeches Frank to assign her son to something safer.
Gibbs and his team are forced to play an extremely dangerous and top-secret war game, but the simulated situation begins to yield very real consequences.
Special Agent Lee's daughter has been abducted and she turns to the NCIS team for help getting the girl back, but they are unsure if they can trust her.
Gibbs' team begins to suspect that the death of a petty officer who was actively involved in the world of underground street-fighting was not accidental.
The team tries to decide whether a Navy captain was the victim of a heinous murder due to his work with classified technology or whether he was selling secrets.
After a recent murder that is connected to one of Tony's old cases leads to it being reopened, Gibbs puts him back in charge in order to solve the crime.
A boy on a Navy base discovers a handgun containing residual brain matter on its barrel, which prompts the team to search for the weapon's owner and the victim.
Erin waits the governor to choose a new district attorney while Danny and Jamie try to convict a drug lord; Frank and his grandson must make a hard choice.