Set in 18th-century Europe, the novel follows Lucia, a mysterious courtesan who always hides her face. In Amsterdam, she meets Casanova, the famous seducer, who challenges her to prove that he has truly wronged a woman who once loved him.
Lucia accepts the challenge and searches for evidence from his past, but she gradually realizes that their meeting is not accidental. She shares a hidden, painful connection with him from years earlier.