Eldorado is a sequel book to the classic adventure tale, The Scarlet Pimpernel. It was first published in 1913. The novel is notable in that it is the partial basis for most of the film treatments of the original book.
As well as containing all the main characters from the first book, Eldorado introduces several new characters and features the Baron de Batz, who also turns up in Sir Percy Leads the Band and The Way of the Scarlet Pimpernel (Baron Jean de Batz is a genuine historical figure).
It is 1794 and Paris, "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."
The plot begins when Sir Percy reluctantly agrees to take Armand St. Just with him to France as part of a plan to rescue the young Dauphin.
There has of late years crept so much confusion into the mind of the student as well as of the general reader as to the identity of the Scarlet Pimpernel with that of the Gascon Royalist plotter known to history as the Baron de Batz, that the time seems opportune for setting all doubts on that subject at rest.
The identity of the Scarlet Pimpernel is in no way whatever connected with that of the Baron de Batz, and even superficial reflection will soon bring the mind to the conclusion that great fundamental differences existed in these two men, in their personality, in their character, and, above all, in their aims.
According to one or two enthusiastic historians, the Baron de Batz was the chief agent in a vast network of conspiracy, entirely supported by foreign money—both English and Austrian—and which had for its object the overthrow of the Republican Government and the restoration of the monarchy in France.