NCIS investigates the murder of a federal prison inmate who was the adopted daughter of a notorious counterfeiter. Also, Callen is summoned by the Alcohol, Tobacco and Firearms (ATF) Internal Affairs board to discuss Anna Kolcheck's actions during a joint NCIS and ATF case.

Despite several team members with grave reservations, NCIS travels to Mexico for a risky mission to locate and rescue Mosley's son.