A Man Walks into a Bar...

A naval commander is found dead in his rack aboard ship, apparently murdered. The NCIS team investigates while having to deal with mandatory psychological evaluations conducted by Dr. Rachel Cranston, who is eventually revealed to be the older sister of their former colleague and friend, Agent Caitlin Todd. It is discovered that the commander had actually committed suicide due to facing mandatory retirement and having no other life other than the Navy, and his colleagues had disguised the suicide out of respect for him.