Belle Varens is the English-born illegitimate daughter of an actress and has an "unseemly" history herself. She's an operative who risks her life to rescue aristocrats from the guillotine during the empireship of Napoleon. Sinclair Carrington is the estranged son of an English noble. Both are ordered to work together in a plot to abduct a high-profile French official. Unbeknownst Belle, Sinclair is working for military intelligence to uncover a traitor in the network that employs her. Unbeknownst to both of them, a third party intends to sabotage their efforts. Revolutionary France is an exciting period to set a story and danger is what these two characters crave. Belle is a woman of "easy virtue, " which immediately makes her intriguing as a heroine. The worry of reputation has little impact on her actions. She pursues no pretensions in that quarter. Sinclair is likeable simply because she appeals to him regardless.