1768. Charlotte, daughter of the Habsburg Empress, arrives in Naples to marry a man she has never met. Her sister Antoine is sent to France, and in the mirrored corridors of Versailles they rename her Marie Antoinette. When they were only children, the sisters discovered a book of spells that work with dark and unpredictable consequences. In a time of vicious court politics, they use the book to take control of their lives. But every spell requires a sacrifice. And as love between the sisters turns to rivalry, they will send Europe spiraling into revolution.