A Notorious Ruin - The Sinclair Sisters Series, #2

All the widowed Lucy Sinclair Wilcott wants is to save enough money to move to a cottage of her own and keep her younger sister safe from the consequences of their father's poor judgment. No one is more aware than she how thoroughly her first marriage ruined her. She could not remarry if she wanted to. Then the Marquess of Thrale comes to visit and long-absent feelings of desire surge back. Everything Lord Thrale believes about the beautiful Mrs.
Wilcott is wrong. The very last woman he thought he was interested in proves to be a brilliant, amusing, arousing woman of deep honor who is everything he wants in a lover, for the rest of his life. If only he can convince her of that.