Jeanne Coulomb is the most powerful and strong-willed lady in the land, possessing the rare ability to see spirits. Because her mother disapproved of her outspoken nature, Jeanne was sent away to live in a convent from the age of ten. Now sixteen years old, she receives a letter from her sister Marise, the Countess of the Coulomb household, urgently summoning her home.

Upon her return, Jeanne discovers that Marise is being haunted by spirits, and a marriage proposal has been arranged for the Countess despite the dangerous situation. Jeanne makes her sister an offer she will exorcise the spirits on the condition that Marise withdraws from the unwanted marriage arrangement. As Jeanne begins to confront the supernatural forces plaguing her sister, Marise reveals an extraordinary secret of her own, setting the stage for a haunted comedy involving the powerful noble family and its spirit-afflicted members.