To Mend the Broken-Hearted: The Healer and the Hermit — Jude Knight

Ruth Winderfield is miserable in London's ballrooms, where the wealth of her family and the question over her birth make her a target for the unscrupulous and a pariah to the high-sticklers. Trained as a healer, she is happiest in a sickroom. When she's caught up in a smallpox epidemic and finds herself quarantined at the remote manor of a reclusive lord, the last thing she expects is to find her heart's desire. A pity he does not feel the same.

Valentine, Earl of Ashbury, hasn't seen his daughter -- if she is his daughter -- in three years. She and her cousin, his niece, remind him of his faithless wife and treacherous brother, whose deaths three years ago will never set him free. Val spends his days trying to restore the estate, or at least prevent further crumbling. When an impertinent bossy female turns up with several sick children, including the girls he is responsible for, he reluctantly gives them shelter. Even more reluctantly, he helps with the nursing. The sooner they leave again the better, even if Ruth has wormed her way into his heart.