Gibbs' team is sent to investigate a death aboard USNS Chimera, a top-secret naval research ship sailing in the middle of the ocean. After boarding the ship, they find it abandoned except for a dead U.S. Navy scientist, who died from viral hemorrhagic fever. However, they suspect that they are not alone. Their investigation is further complicated by the Navy's reluctance to share information regarding the research which took place on Chimera. Ziva's belief in the supernatural is shown.