NCIS investigates an arson attack at Global West Ventures Corp., a naval defense contractor; Rountree connects with an ex; Kilbride gives Callen files on Pembrook.
When a Russian bomber goes missing while flying over U.S. soil, Callen and Sam must track it down in the desert and secure its weapons and intel before the Russians on board destroy the plane; Hetty gives Nell a cryptic assignment.
The NCIS team works with Drug Enforcement Administration agent Talia Del Campo to find a missing whistleblower set to testify against gun manufacturers marketing to drug cartels.
Akhos Laos, a former black ops agent originally recruited and trained by Hetty Lange, returns to seek revenge on Hetty for the life she introduced him to.