During the French Revolution, the Scarlet Pimpernel (David Niven), who is really Sir Percy Blakeney in disguise, risks his life to rescue French noblemen from the guillotine and take them across the English Channel to safety. As cover, Sir Percy poses as a fop at Court, and curries favour with the Prince of Wales (Jack Hawkins) by providing advice about fashion, but secretly he leads The League, a group of noblemen with similar views.