Mrs. Danglars begs Villefort to turn a blind eye to Andrea Cavalcanti's offenses.
She doesn't want her family disgraced by Andrea's crimes.
Villefort refuses to turn a blind eye (remember the two used to be lovers, once upon a time, and Cavalcanti is really the son they once tried to kill when he was just an infant).
Mrs. Danglars and Villefort learn that Andrea Cavalcanti has been captured by police in Compiegne.