At 02:30 Tim's younger sister, Sarah, covered with human blood, shows up at the door of his pad, saying that she thinks that she's killed someone; he sends the office an e-note, saying that he's sick, then he starts to look into it. Gibbs and the rest of the gang investigate the death of a Navy seaman, from USS Enterprise, on the campus of the same university where Sarah attends; Ziva finds 10 more bodies. A phone call becomes troublesome for Tim, Gibbs, and Sarah; Tim feels strong conflicts of interest and of loyalty. Abby finds the weapon, and Gibbs questions Sarah. Abby makes a crucial discovery, then the gang solve the case and nab the people responsible.
—DocRushing