Villefort was the man that had sent Dantes, Mercedes' fiancee to jail.
I have cited the chapter's only two references to Mercedes below. She visits Villefort in neither. Are you sure you're not looking for a meeting in a different chapter. This is a rather long novel to browse through!
"It seemed to the prisoner that he could distinguish a feminine form on the beach, for it was there Mercedes dwelt. How was it that a presentiment did not warn Mercedes that her lover was within three hundred yards of her?
One light alone was visible; and Dantes saw that it came from Mercedes' chamber. Mercedes was the only one awake in the whole settlement. A loud cry could be heard by her. But pride restrained him and he did not utter it. What would his guards think if they heard him shout like a madman?
He remained silent, his eyes fixed upon the light; the boat went on, but the prisoner thought only of Mercedes."
He later speaks that he wished he could escape to a place where Mercedes and his father could join him.
The Count of Monte Cristo/ Chapter 8
