(S07E17) The most important aspect of this 'NCIS' episode was the mystery. No, not the one about the Marine who may or may not have been MIA in Afghanistan, but the one involving Dr. Mallard and the ties. The clues had been laid out throughout the season, and tonight we learned that everything with Ducky was not as plucky as he was leading his friends to believe. More on that, the rain in D.C., and a handsome devil named Mortimer after the jump.