At a party thrown by the Count, the guests play a game. They search for a secret room in the villa where a curse is sealed away. Albert has already discovered one secret kept between the Count and Heloise.

Albert's engagement is in jeopardy; Baron Dangler prefers his daughter to marry into wealth. Albert rushes to the opera house to find Eugenie - but the curtain may have already closed on his love.

Mercedes enters the misty woods to meet the Count - but only a scene of violence is waiting for her.

An abominable memory, consigned to the darkness of the past, has been resurrected by the hands of the Count and his plan of revenge enters its final stage.