When a petty officer is found dead with an apparent suicide note, the NCIS team must investigate the mystery surrounding his death. Also, Callen and Anna begin wedding planning and Sam has a heart to heart with his daughter.

When the NCIS team receives a cryptic, urgent message, Fatima and Rountree must work together to solve the case. Also, Kilbride plans to visit his son, and Callen asks Sam to be his best man.