Parker's delinquent past resurfaces when NCIS is called to Philadelphia to investigate the death of a Navy petty officer.
When a sports star is killed, Shaw and Riley suspect the shooter missed their intended target.
This episode serves as the culmination of Catherine's pursuit to track down those that murdered her friend, Grace Huang. Catherine finds Mikel Koslov in Bulgaria and convinces him to come back to Vegas with promises of an immunity deal.
Freya runs for President of the Boomtown Homeowners Association. Morris takes Sid on a perilous business trip.
