Lord Montbarry’s death
It is ironic that Lord Montbarry dies soon after his marriage to the Countess, and despite suspicions of murder, no one thinks to consider it was she who committed the murder.
Agnes' vengeance
It is ironic that in the beginning Agnes is jilted by Lord Montbarry and her position is taken by the Countess. Yet, at the end, she manages to avenge his death and indeed, even marries his brother, Henry, thus cementing her role in the Countess’ former position as Lady of the house.
The script
It is ironic that the Countess tried to get away with the murder of her husband, but she simultaneously dotted the tale as a ghost story and handed the script over to Henry and Agnes to read, thus revealing herself as the murderer.
Countess and Baron’s death
It is ironic that the main reason that the two plotted to kill Lord Montbarry was so they could take his life insurance money and start a new life together. Yet, in the end Baron is killed, and the Countess, unable to live without her true love, kills herself to be with him.
