These Old Shades
by Georgette Heyer is a historical romance set in 18th-century France and England. The story follows the powerful and enigmatic Duke of Avon, who rescues a mistreated young boy named Léon from the streets of Paris. Avon soon discovers that Léon is actually Léonie, a girl disguised as a boy, and that she may be the key to a long-awaited revenge against his old enemy, the Comte de Saint-Vire.
As Léonie grows into a charming and spirited young woman, she and the Duke develop a deep bond that blossoms into love. The novel blends romance, intrigue, and wit, with themes of identity, justice, and redemption. It's a classic example of Heyer's elegant storytelling and rich historical detail.