Clever and charming Roslyn Loring, the middle child of three beautiful, independent sisters, knows that true happiness lies in a marriage of the heart – and she has hers set on a love-match with a neighboring earl. Yet her sharp mind has observed an undeniable truth: Gentlemen lavish passion on their mistresses, not their wives. Roslyn realizes that to win her future husband's devotion, she must learn the secrets of kindling a gentleman's ardor. Fortunately, she finds a willing tutor in Drew Moncrief, the Duke of Arden, a notorious rake whispered to be London's most magnificent lover. If his searing kisses are any indication, the duke is the ideal man to teach Roslyn how to be the perfect mistress.

Drew begins schooling Roslyn while coolly guarding his heart. But as best-laid plans are thwarted by unexpected events – including a night of unforgettable passion – Roslyn and her wickedly arousing tutor discover how easily lessons in pleasure can become lessons in love....