A Lt. Navy Commander is the target of an assassination plot, and the team must figure out why. Abby learns she is adopted after a failed attempt at kidney donation.

The line between McGee’s personal and professional life is blurred when NCIS uncovers a connection between his grandmother and a killing.

The NCIS team uncovers a startling surprise after a young Marine shows up to his homecoming party with a fatal stab wound.

After spending months tracking down his target, Tony is left with the blood of an NCIS agent on his hands in the ninth season premiere.