Marneffe to break up the union at the title character's behest.  
In Chapter 30of this work the Marshall Prince de Wissembourg tells a story about a man who eats glass in order to save his honor.  That story is told after a character in this work discovers a letter written from a prison in Oran, where his uncle, Johann, has been arrested for a scheme to defraud the crown.  This work's final chapter, which ends with the declaration that "children cannot prevent the folly of parents in their second childhood," depicts Agathe seducing the purportedly reformed Baron.  Upon hearing that her beloved, a struggling sculptor, is engaged, the main character entreats Grasset to arrest him for debt.  When Hortense and Steinbock, marry anyway, it is left up to the opportunistic Mme. Marneffe to break up the union at the title character's behest.  Ultimately the Hulot family is ruined by Adeline's family relation.  For 10 points, identify this work centering on the scheming Lisbeth Fischer, a novel by Honore de Balzac.
In Chapter 30of this work the Marshall Prince de Wissembourg tells a story about a man who eats glass in order to save his honor.  
Cousin Bette