Baroness Emmuska Orczy 
El Dorado [PDF ebook] 
An Adventure of the Scarlet Pimpernel

Baroness Orczy’s classic adventure novel El Dorado is the sequel to The Scarlet Pimpernel and was first published in 1913. Set in 1794’s Paris — which "despite the horrors that had stained her walls — has remained a city of pleasure, and the knife of the guillotine did scarce descend more often than did the drop-scenes on the stage."