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Watch What No One Knows online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

In this political thriller, a young woman is found drowned on a winter night by the sea. The dead woman's brother, Thomas, discovers that her death is connected to their father, now deceased, and his work in military intelligence. As Thomas digs deeper into the case his family is brought into sudden danger.