Due to her father’s desire to have a male heir but having five daughters, he decides to raise his newest born daughter as a boy so she can take his place as commander of the royal guards. Despite being raised and dressed as a boy, she is open about being a female but still uses her male position to gain freedom and rights not allowed to women at the time. She serves as the love interest of André Grandier, her servant along with Queen Marie Antoinette, who she guards. In addition, she falls in love with Fersen who loves the queen and earns the love of Rosalie Lamorlière. However, she ultimately returns Andre’s feelings for her and marries him. The two share one night of passion before Andre dies from his wounds, and later Oscar also loses her life during the French revolution.