Virtue (V #2)
Jane Feather

But the Davenports never bargained for the penetrating scrutiny of a certain strikingly handsome lord who had come to see for himself the woman who had all of Brussels at her feet, including his besotted nephew. Marcus Devlin, the honorable marquis of Carrington, wasn't fooled for an instant by Judith's air of innocence—or by her flirtatious way with a fan. Instead he was amused, infuriated, and intrigued enough to draw the bewitching schemer into a daring gamble of his own . . . where the stakes were nothing less than the lady's heart.