Baroness Emmuska Orczy 
Man in Grey Being Episodes of the Chovan Conspiracies in Normandy during the First Empire [EPUB ebook] 

The Man in Grey by Baroness Orczy, author of The Scarlet Pimpernel, was first published in 1918. This time Orczy sets the action in post-revolutionary France. The book takes the form of a novel but is divided up into nine inter-connected short stories about the mysterious Man in Grey’s adventures in tracking down Royalist criminals for the Government.