A cadaver packed in dry ice inside a wooden crate arrives at a highly classified secure Navy facility; Gibbs and company receive a call, then start an investigation on-site; however, those events are a setup to enable the Gibbs gang to test the physical security of the facility. Further, that test is itself a ruse by which to identify and catch a mole within the NCIS. Gibbs, Tony, and Ziva meet the SecNav. The door to Abbyville causes problems. Vance calls a meeting in the evidence garage, and he sends Lee out on an errand. The team meet Lee outside; that leads to a session between Gibbs and Lee in his chat room. Gibbs says that he and Lee now work together.