A decomposed body is discovered in a tub of acid at a naval base and Ducky and Abby learn that the victim was a submariner.
Jessica (Angela Lansbury) tries to discover who is terrorizing her wealthy friend (Ann Blyth).
When a frazzled mother, Lillian, bursts into the Philadelphia Police Department claiming to know who might have killed her daughter at a 1968 debutante ball, Rush reopens the case. Lillian begs Rush and the team to search for her daughter's killer when a newspaper story reports on a man pushing his wife down the stairs.
Harm and Mac must prosecute a Marine colonel who defied orders in order to rescue his men from a Haitian warlord.
Mike and Sully fight Colleen and Brians biological father for custody.
