François VIDOCQ (1775-1857). 2 L.S., 1836-1837; and 30 letters to him, 1834-1842; ca. 50 pages, various sizes. Curious file, relating to his business and his intelligence agency, as the heading of his letter to M. de Saint-Albin La Gayère indicates: "E.F. Vidocq (breveté). The intermediary, Bureau de Renseignemens dans l'Intérêt du Commerce. 20 francs per year And one is safe from the ruse of the most skilful rogues". Letters from clients calling on his services, answers from informants, from people working for him and carrying out various researches, legal problems (he was imprisoned in 1937), business and payment disputes, etc... Of the thirty or so letters addressed to him, half are from a certain Menissier...