The NCIS team discovers a tip about terrorist activity was a trap that resulted in the death of two agents. Blaming herself, Agent Cassidy works with the NCIS team to track down the people responsible.

Director Shepard takes a huge risk and agrees to meet an informant alone, but the meeting goes bad and her contact is killed. Gibbs and the NCIS team attempt to gather the information the man was going to supply or risk losing their nemesis once again.