The Scarlet Pimpernel Teaching Guide - Penguin Books
http://www.penguin.com/static/pdf/teachersguides/pimpernel.pdf
This well-written teaching guide is a useful tool for understanding and analyzing The Scarlet Pimpernel in more depth.
Baroness Emma "Emmuska" Orczy - Literary Ladies Guide
https://www.literaryladiesguide.com/author-biography/baroness-emma-emmuska-orczy/
A brief and helpful biography of Baroness Emma Orczy, which also includes likes to additional resources about the author.