本季一開始國防部副部長因為內部的內奸問題再起風波，處處都被監視，同時調查團隊被委派調查有關敘利亞恐怖份子的高價目標案件。
In the season premiere, the NCIS team is under investigation by the Under Secretary of the Navy due to the identification of a mole in their department. With every move being monitored, the team is assigned a High Value Target case involving a Syrian terrorist.
