Born to a life of wealth and status, Mademoiselle Dacia de Prideaux is every inch the glittering aristocrat. However, her brother, Marcel, is an outspoken political activist, and with the country on the verge of the French Revolution, he has made dangerous enemies—one of whom takes Marcel's life. When Dacia is accused of the unthinkable crime, she finds refuge with her dear friend Marguerite St. Just, who believes there is one man with the means to help: the wealthy fop, Sir Percy Blakeney.

Intent on rescuing people from perilous circumstances, Richard Harris, wealthy English landowner and member of Sir Percy's league of gentleman heroes, has been assigned to protect Dacia. Hiding her in plain sight and masquerading her as a housemaid at his estate, Richard soon comes to trust the beautiful woman under his protection, and their feelings for each other grow stronger each day. But Marcel's murderer will never stop pursuing Dacia, and she will need both her cunning and Richard's connection to the legendary Scarlet Pimpernel to survive.