Richard E. Grant returns as the foppish English aristocrat Sir Percy Blakeney with a secret identity as the daring and swashbuckling Scarlet Pimpernel, rescuing noblemen from the clutches of the guillotine during the height of the French Revolution. In this final film of the series, The Scarlet Pimpernel is drawn into a mystery which threatens to destroy the French Monarchy forever whilst putting his own life in grave danger. The heir to the French throne - 10 year old Dauphin - is under the control of Robspierre but is kidnapped by a sinister masked character. As Sir Percy gets close to witnesses who might identify the Dauphin's kidnapper they are killed before they can reveal the truth. However, all the signs point to the legendary swordsman Chevalier D'Orly - the only person with the skill and strength needed for the daring kidnap.