In New Orleans, Louisiana, two local special agents of the NCIS, Pride and LaSalle, start to investigate the death of Dan McLane, who was not only a member of the US House of Representatives but also both a retired Naval Reserve commander and a retired agent of the NIS (before the NCIS); Dan had worked with Franks and had served as a mentor to both Pride and Gibbs; King Pride, a former partner of Gibbs, goes to Washington, DC, and spends time with Gibbs. Inter-agency intrigue begins; the FBI seizes control; a joint FBI-NCIS effort proceeds; Fornell joins the hunting party; the Gibbs team start producing results; King and Gibbs use an old-school technique; LaSalle in Nola says that he suddenly feels new respect for the Great Lakes office. An FBI agent in Nola dies in the same way as Dan; King goes back there, and Gibbs and Ellie go with him; Abby provides answers; the bunch in Nola follow the breadcrumbs left for them. [To be continued.]

While investigating the death of a US congressman, the Gibbs team and the gang in Nola continue to seek both a killer and a connection to an old case. Another man dies. Ducky suggests a theory, and the bunch put all the pieces together.