One man kills a second one for a small but heavy plywood box, then a third man kills the first one and takes the box; one victim bears a Navy ID card, so Callen and company investigate. The dead sailor was a seaman, Davis, on UA for six weeks from USS Enterprise, recently stationed in the Red Sea off the coast of Sudan, in northeastern Africa; G recognizes the other vic as a British arms dealer with ties to terrorist groups. Back in the USA the Davis widow describes her husband's involvement with the box and its contents; after a gunfight G and Sam hear more about the contents. Eric pursues a clue, then the gang find the body of the thief, and they meet a friend of Sam, who reveals the real nature of the contents, which raise huge concerns; they snag a part of the contents; Eric and Nell direct them to the remainder, and Kensi discovers the target, where the gang grab the rest of the stuff and the other bad guys, and they forestall a huge disaster. Both Eric and Nell get flowers.