Silk and Shadows: Book 1 of the Silk Trilogy:

Like the falcon he named himself for, Peregrine is wild and free, an exotic prince who fascinates 1839 London with his wealth, mystery, and dangerous allure. He emerged from his mysterious Asiatic past to exact retribution for an appalling crime. Nothing and no one can stop him--except perhaps Lady Sara St. James, whose fragile beauty conceals a gentle heart, genuine goodness, and a soul of steel. Unable to resist his seductive charm, Lady Sara turns away from her ordered life to embrace a man she loves, but cannot fully trust. In Sara, Peregrine sees a chance for a life beyond revenge. But can he keep her without revealing his devastating secrets? Or protect her from the enemy he has vowed to destroy?