The NCIS team searches for a suspect and their motive following the bombing of a large facility where military combat drones are assembled. Callen and Kilbride get troubling news about a body found in Syria.
A man suddenly attacks a family event at East Coast Park, driving into the crowd recklessly and then exits the vehicle, slashing whoever comes into his sight. After experiencing this traumatic event, the survivors face immense challenges in rebuilding their life.