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The Sign of Four (1987)

7.4/10 (76 votes) 1h 43m Movie
CrimeMysteryThriller

Mary Morstan has received a pearl in the post every year since her father's disappearance. This leads Holmes and Watson to the truth about a secret pact between four convicts during the Indian Rebellion of 1857.

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Yes, The Sign of Four is available for free on Plex Channel.