Tony and Ziva seize an Israeli illicit arms dealer, and he trades them some valuable information. Tony and Ziva tail Harrow, a retired puzzle maker; he spots them, he runs, they pursue, and he collapses and dies with a heart attack. Tony lies to Gibbs about his doing for the director an undercover detail related to the current case; Gibbs digs it. Jen wants to catch the Frog, another dealer, who expects to meet Harrow, but Harrow has died, so the gang disguise Ducky as Harrow, a Brit, and coach him; they send Ducky to make the exchange, and the gang and the director go with him but stay in the background. The exchange takes place, but Jen and the gang do not get the Frog.
—DocRushing