Orczy went on to write over a dozen sequels featuring Sir Percy Blakeney, his family, and the other members of the League of the Scarlet Pimpernel, of which the first, "I Will Repay" (1906), was the most popular. The last Pimpernel book, "Mam'zelle Guillotine", was published in 1940. None of her three subsequent plays matched the success of "The Scarlet Pimpernel". She also wrote popular mystery fiction and many adventure romances. Her "Lady Molly of Scotland Yard" was an early example of a female detective as the main character. Other popular detective stories featured "The Old Man in the Corner", a sleuth who chiefly used logic to solve crimes. Orczy was a founding member of the Detection Club (1930).