In this sequel to The Scarlet Pimpernel, Sir Percy Blakeney's arch-enemy travels to England in pursuit of the impudent enemy of the French Republic. Monsieur Chauvelin devises a dastardly plot to annihilate, once and for all, both Sir Percy and his beautiful wife, Marguerite. Lured to France, where the entire town of Boulogne is held hostage on their behalf, they seem to be hopelessly trapped. Will the Scarlet Pimpernel prevail?