The dramatic events of the composer Mario Sirchi, falsely accused of murder, and his girlfriend Adonella who is revealed to have a secret sister, Nayda.

Sara is a very beautiful gypsy. One fine day, she meets a rich English woman, to whom she strangely reminds her late daughter. She decides to give her an education and after her death, makes her heiress. In Naples, the young girl meets General de Canhailles, whom she marries, despite the age difference and her attraction for Lieutenant Pietro Severac, and obtains the title of princess. Having become the adulated figure of the Parisian world, Sara refuses Severac's advances. Until the day he is sent to Algeria.