Iraq veteran Marine Damon Werth asks Gibb's help after witnessing his mate being killed on a truck-ride for their dodgy employer, Aaron Szwed, suspected of smuggling and hits. FBI Agent T.C. Fornell allows the NCIS team to join in, in fact Gibbs take the lead, on his jurisdiction. Damon goes undercover on another ride, with Ziva as his partner. They find the cargo is legal, yet provides a surprising motive.