Almost two years after a devastating loss, the Duke of Castamar hosts a big party. An agoraphobic Clara is forced to prove herself at her new job.

Singer Carlo Broschi is invited to perform a concert at Castamar. Diego meets a young woman and Clara gets jealous. During the party, tragedy strikes.

When Clara is found unconscious, Diego insists on staying by her bedside, no matter the social implications. Amelia, however, won't be deterred.

The day of Diego and Amelia's wedding — and Clara's father's execution — brings multiple last-minute surprises for everyone at Castamar.