The Scarlet Pimpernel (1934)

London fop Percy Blakeney is also secretly the Scarlet Pimpernel who, in a variety of disguises, makes repeated daring trips to France to save aristocrats from Madame Guillotine. His unknowing wife is also French, and she finds that her brother has been arrested by the Republic to try to get her to find out who "that damned elusive Pimpernel" really is.