Her low standing as companion to the three neglected young wards of the aristocratic Marquis of Capel does not prevent Harriet Yorks from confronting the Marquis with his responsibilities towards them.

She makes her bold assault on his London home - not for nothing is she called the Devil's Daughter - as the Marquis is leaving to fight a dangerous duel, and fiery Harriet's ill-timed interference there almost causes his death.

To make amends, Harriet nurses the wounded Marquis, hoping that her tender care will win his heart. Yet other men are quicker to respond to her charms than Harriet's obstinate patient, who refuses to alter his low opinion of her. Perhaps jealousy is the answer? And what better rival for her affections than the gallant Lord Bruce Wendover, who is always at hand...