Paris, 1830. Fleur de Marie is rescued from poverty by the mysterious Rodolphe, who is in fact the Grand Duke of Gérolstein, who has gone incognito in search of an illegitimate child he once had. Which is not at all to the taste of Sarah Mac Gregor, her current mistress who kidnaps Fleur and has her locked up in Saint-Lazare prison.

In the heart of Paris, a restaurateur's mundane life is disrupted by the arrival of his ex-wife's daughter, who claims to be in need after her mother's death. After marrying her, tensions rise when she becomes involved with a young student, leading to betrayal and murder. As secrets unfold, he uncovers the truth about her past and her manipulative nature.