Sarawareta Heart

Sarawareta Heart summary:

[from FantasticFiction] Princess Marie-Therese and her brother elude their escorts to spend seven carefree days in Paris before she becomes engaged to an English Duke. In the glittering world of gaiety that marked the Second Empire, the Princess pretends to be Zena, her brother's mistress. This farce brings unexpected problems, especially when she falls in love with the Comte de Graumont. Can love triumph over a royal decree and her father's anger?