Lord Carnall and Miss Innocent — Julia Donner

Ana Worth has problems enough with the struggle to keep her seminary from financial ruin and her wastrel brother out of debtors' prison. More trouble lands on her doorstep in the form of Lord Carnall and his two sisters. She can't trust the motives of the irresistible marquis and doesn't understand his interest in her, other than a short-lived affair, until she discovers he's a man on a quest for revenge.