When a Marine Corporal dies in a tide pool after being exposed to fentanyl, the NCIS team must quickly find the source of the drugs. Also, Alex talks to his parents about taking a gap year and Ernie reveals personal news to Lucy.
Set in the Aloha State, follow Jane Tennant and her team as they balance duty to family and country, investigating high-stakes crimes involving military personnel, national security and the mysteries of the island itself.