On a sidewalk in Washington, DC, a displeased former fiancée stabs to death a Navy boatswain's mate first-class; Gibbs and company investigate; they quickly find the assailant nearby. While the gang work on-site, a different woman shouts at Ducky in Dari (a.k.a. Farsi), and, grabbing and using the murder weapon, stabs him through one hand and escapes into the crowd of spectators. A translator says that the woman accused Ducky of having killed her brother; Ducky readily agrees that he did so; Abby identifies the woman as an Afghan immigrant, who has now obtained refuge in the Afghan embassy. Ducky surrenders at the Afghan embassy to face charges for an incident while Ducky served in Afghanistan 30 years ago in the Royal Army Medical Corps. Gibbs obtains and uses information obtained from a CIA operative. Conversations at the embassy result in the release of Ducky and the withdrawal of charges.