1863. Vols. 1 and 2. This work is the result of many years' random readings and research. Much of the matter offered in these volumes is, the author believes, novel, while in those chapters more familiar to the English, but which his scheme did not allow him to omit, he did his best to exhaust the subject, and bring together every scrap of information which may prove to the slightest use for elucidating a mystery. Sample contents: False Dauphins, Pseudo Queen, Iron Mask, Pretender in the 16th Century, Cagliostro, Countess von Rochlitz, Chevalier D'Eon, Marechal de la Force.