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During the French Revolution, Englishman Sir Percy Blakeney (David Niven) dons an outlandish disguise to become the Scarlet Pimpernel, and rescues doomed French aristocrats from the guillotine, sneaking them to safety in London. To protect his secret identity, Percy acts as a coward and a fool around his fellow English noblemen. When Percy's brother-in-law, Armand St. Just (Edmond Audran), is taken prisoner in France, it's up to the Scarlet Pimpernel to rescue him. Wikipedia