Ziva surprises Gibbs with a cryptic warning, prompting him to question why she remained underground for years while being presumed dead by family and friends, and what led to her return.

After the body of a Marine Lieutenant is found hidden under an 18-wheeler, the NCIS team tracks the vehicle's previous locations to pinpoint the crime scene and suspect. Also, Sloane encourages the team to sit down and talk about Ziva's recent reappearance.