El Dorado: An Adventure of the Scarlet Pimpernel

Scarlet Pimpernel is the alter ego of Sir Percy Blakeney, a wealthy English fop who turns into a quick-thinking escape artist in order to save French aristocrats from "Madame Guillotine" during the French Revolution. In this book, Scarlet Pimpernel has to rescue the son of Louis XVI and Marie Antoinette, who is imprisoned and about to face execution.