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Watch Navy NCIS: Naval Criminal Investigative Service Season 4 Episode 21 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Director Shepard makes a huge mistake by meeting a man alone to inform her about La Grenouille, as their meeting turns into a murder of the informant. Now the NCIS team must gather all the existing info and try to finally hunt down their enemy.