While Ducky remains on a medical leave, he arranges for the exhumation of the body of a Navy commander whose autopsy he conducted 12 years ago; Duckman suddenly realizes that the dead man may have died from murder rather than excessive drinking; Gibbs and the Duck exchange heated words. Meanwhile Gibbs and the gang investigate the death of a Marine sergeant in Brooklyn, New York, who was about to make a one-way journey. First Abby confirms Ducky's suspicion, then she finds a copy of a curious document on the dead sergeant's laptop computer; Gibbs invokes rule 38 in the case of the Duck, who says that he and his cohorts must cast asunder the evil now afoot. Tony and Ziva learn about some old dust, and Abby finds an old connection between the two dead guys. Gibbs and the gang talk with a rocker, then Ducky does so. Abby finds an important link, then Ducky and the gang put the pieces together, and Gibbs sends the Duck back to his own workshop.