Book:
The Scarlet Pimpernel by Baroness Orczy, published 1905.
11 sequels plus numerous short stories
Movie adaptations:
Scarlet Pimpernel (1934), starring Leslie Howard and Merle Oberon- The BEST adaptation
Pimpernel Smith (1941), Leslie Howard- Meh.
The Elusive Pimpernel (1950), David Niven and Margaret Leighton- Rita hated, Xoe loved the surreal sets.
The Scarlet Pimpernel (1982), Anthony Andrews and Jane Seymour- Solid adaptation.
TV:
Scarlet Pimpernel (1999)- Not very good.