The body of a man, shot and drowned, washes up on a beach in Maryland; the victim was a Navy petty officer; while Gibbs and company investigate at the scene, another body, wrapped in anchor chain, turns up. Gibbs suggests that the PO stumbled onto a mob hit; Fornell tells Gibbs about the second victim; the two of them agree that the feds have a problem with a leak in their witness-protection program. The office of a private security firm explodes nearby while Gibbs and Fornell talk with a polygraph tech; Abby gets a new toy; the gang check out the explosion, and McGoo talks with the tech. Duckman and Palmer work on 10 more bodies; Abby, McGee, and the tech remotely watch the theft of the tech's home computer. Abby provides answers, which raise more questions. Gibbs and Fornell figure out the leak, confront that person, and deal with the problem. McGee asks for a dinner date but fails to get it.