Ziva, a Mossad agent, returns to the NCIS and to the Gibbs team as a liaison officer; after a rocky start Gibbs accepts her presence his own way. A 140-year-old iron casket shows up at a construction site near a Civil War battlefield in northern Virginia; it undergoes an inspection at the Smithsonian Institution, in Washington, DC, where a forensic anthropologist contacts the NCIS after she sees a cellphone inside the casket. The body is that of a staff sergeant in the Marine Corps, who served as an instructor at Quantico, reported UA about a year before. Ducky finds the horrible cause of death. Abby and McGee find a message, then he and Ziva find and lose a clue. The team figures it out and wrap it up, then Gibbs and Ziva make peace their own way, and she gets a different desk.
—DocRushing