NCIS and CGIS conduct a joint-investigation when a Coast Guard officer is shot dead during a night-time examination of a ship. The NCIS team soon discover that a Lebanese family has been secretly stowing away on the ship and begin questioning them but some of the family are not who they claim to be. Things later take a turn for the worse when Abby discovers evidence suggesting that a potential terrorist attack is in the works, one that if successful could completely destroy half of the Norfolk Naval Base while Tony, McGee and Ziva with Borin's help attempt to find the right woman for Gibbs.