Lady Ophelia, the daughter of an earl, possesses a peculiar gift — she can sense lies as if her body reacts to them. Because of this “lie-detection” ability, she’s shunned by society and keeps to herself to avoid trouble. One day, the notoriously moody Duke Claudio discovers her secret and becomes both intrigued and suspicious. To deal with her, he demands a “manual” for how to manage a noblewoman who can literally detect falsehoods. Thrown into his household, Ophelia must learn to navigate his blunt personality, a world of noble deceit, and her own growing feelings for the man who refuses to lie — even when the truth hurts.