Gibbs and the team look for a potential serial killer when an explosion at a military cemetery mausoleum reveals a cache of dismembered human remains.

When Ducky and Abby confirm that they have identified the remains of at least five people, the NCIS team immediately begins notifying the families in the hopes of making some connection between the seemingly random selection of victims. But when the suspects are narrowed down, even Gibbs is surprised with the final outcome. Meanwhile, Abby turns to Gibbs with a personal problem.