Watch Online Free on Watchseries. The Scarlet Pimpernel is a musical with music by Frank Wildhorn and lyrics & book by Nan Knighton, based on the 1905 novel of the same name by Baroness Orczy. The show is set in England and France during the Reign of Terror of the French Revolution. The story is a precursor to the spy fiction and the superhero genres, where a hero hides under a mild-mannered alias.