When an anonymous tip leads to the discovery of a young Marine's body at a chilling crime scene, Randy believes it could be connected to a previous case where a coin was left in the victim's throat.

When Lala's favorite CI is shot, the team joins forces with Oceanside PD to determine who was behind the attack. Also, Franks visits his brother Mason at the compound, and Gibbs' relationship with Diane is tested when she gets a job in Los Angeles.