Pride and the NCIS team hope to take down a secret and lethal group of former intelligence agents and avenge the death of someone close to them.

After an elusive terrorist with a personal vendetta against Hannah resurfaces, she is placed in protective custody with her family while the NCIS team searches for the suspect’s whereabouts.

Tammy is convinced that a con man committed the hit-and-run murder of a Navy doctor, even though the evidence shows otherwise. Also, unbeknownst to Hannah, her husband, Ryan Porter, approaches Pride with new intel on Apollyon, the underground spy network responsible for murdering his father.

Pride must cut his vacation short when Hannah is suspended for breaking protocol during a joint investigation with the FBI.

When a man impersonating Lasalle attempts to free a young woman from jail, the team investigates both the imposter and the prisoner. Also, Pride's daughter pays him a surprise visit.

When a Navy sailor is found dead, the team tracks the suspicious movements of people in his life prior to his death. Also, Hannah comes to terms with her daughter's relationship with her ex's new girlfriend, Veronica.

As New Orleans grapples with the effects of COVID-19, Pride sends Tammy and Carter to investigate a suspicious death aboard a humanitarian ship offshore, where they learn that some crew members are infected with the deadly disease. Meanwhile, Wade is overwhelmed by the high volume in the morgue due to COVID-19.