I recently read in an article by Michel Butor that a group of 3 novels constitute the "spinal column" of Balzac's Comedie Humaine: Lost Illusions (Illusions Perdues), A Harlot High and Low (Splendeurs et Miseres des Courtisanes) and The Last Incarnation of Vautrin (La Derniere Incarnationde Vautrin). The last mentioned novel doesn't seem to exist, at least not on any listing I can find of Balzac's works! There is a chapter of only around 4 pages late in A Harlot High and Low called "Last Incarnation", but otherwise I find no trace of a novel by such a name. Can anyone solve this mystery for me?