- Collette: a 17-year-old girl living in Louisiana who goes to Paris after receiving a letter she believes is from Marie Antoinette, Queen of France. She is a strong and determined girl who is willing to do whatever it takes to find the truth.
- Charlotte: Collette's best friend, who is more cautious than Collette and often tries to talk her out of taking risks.
- Louis: Collette's love interest, who is also a ghost like Marie Antoinette. He is kind, caring, and supportive towards Collette.
- Marie Antoinette: the Queen of France who was executed during the French Revolution, who appears as a ghost to Collette. She guides her on a journey to discover the truth about her past and the events that led to her execution.