Mrs. Villefort collapses, a victim of her own poison. They youths escape.
Mr. Villefort puts the clues together and has her committed.
Albert's fiancé, Eugenie, is set to play the piano at the opera house.
Her father wants to cancel their engagement.
Mr. Danglars throws Albert out of the opera house, but he sneaks in backstage to watch their performance.
It turns out that Cavalcanti arranged the performance and paid for all the tickets.
The Count is arrested on suspicion of poisoning.