When a desperate man barricades himself inside an ammo warehouse, Knight is the only negotiator he'll talk to, claiming she once saved him before. As explosives tick and trust frays, Knight clashes with the CID officer running the standoff, each convinced theirs is the only way out.

When the son of a Marine that Gibbs once helped comes to NCIS in desperation, the fractured team reunites off the books. But chasing justice without a badge may cost them more than their careers.