Lady Molly of Scotland Yard is about Molly Robertson-Kirk, an early fictional female detective, written by Baroness Orczy, who is best known as the creator of The Scarlet Pimpernel, but who also invented two immortal turn-of-the-century detectives in The Old Man in the Corner and Lady Molly. First published in 1910, Orczy’s female detective was the precursor of the lay sleuth who relies on brains rather than brawn.
The Scarlet Pimpernel is a play and adventure novel (1905) by Baroness Emma Orczy set during the Reign of Terror following the start of the French Revolution. The title character, Sir Percy Blakeney, represents the original "hero with a secret identity" that inspired subsequent literary creations such as Don Diego de la Vega (El Zorro) and Bruce Wayne (Batman). | Wikipedia (Cover of the 1908 edition)