During a joint Coast Guard and NCIS training exercise which is being conducted at sea, Gibbs and CGIS Agent Borin spot a dead man overboard who is later discovered to be a missing crew member from a ship sixty nautical miles away. Seeking answers, NCIS and CGIS launch a joint investigation with Gibbs later arriving on the ship, the San Dominick and discovering that the ship itself has apparently been taken over by a group of pirates but all is not what it seems....