Season of the Marchiones by Patricia Haverton

She, as no other ever could, reached every corner of his heart.

Powerful and influential Lady Harriet Windsor’s pampered life takes a turn when she becomes the guardian of her orphaned cousin.
Used to always getting her way, she comes to the jarring realization that she must now secure her young charge’s future. And she is willing to pull every string at her disposal to do just that.
Playful and flirty with a certain disregard for social etiquette, Timothy Ramsay, third son of the Marquess of Westbrook, has a reputation to match his mischievous ways. With his family unable to control him and many a respectable lady warning their daughters to stay away from him, he is a true heartbreaker. Or is he?
Unable to stay away from each other once they cross paths, Timothy’s undesirable reputation is not the only trial they must face: a bet he made to conquer the challenge that is Harriet’s heart comes to light. Thrown in the middle of a game they think they can control, they belatedly realize they focused on the king and lost sight of the most important player: the pawn.