The Scarlet Pimpernel..

 .... is the first novel in a series of historical fiction by Baroness Orczy, published in 1905.
The novel is set during the Reign of Terror following the start of the French Revolution. The title is the nom de guerre of its hero and protagonist, a chivalrous Englishman who rescues aristocrats before they are sent to the guillotine. Sir Percy Blakeney leads a double life: apparently nothing more than a wealthy fop, but in reality a formidable swordsman and a quick-thinking master of disguise and escape artist. The band of gentlemen who assist him are the only ones who know of his secret identity. He is known by his symbol, a simple flower, the scarlet pimpernel (Anagallis arvensis).
(Wikipedia)