Known to All — Gloria Gay

Violet Durbin lives a quiet life on the fringes of society until she crosses paths with the Duke of Hawkinson, when the duke tries to prevent his nephew from seeing her and in the process falls in love with her.

Phillip Harding Durbin, Viscount Kelly, did what was very rarely done in society: he married his mistress and publicly acknowledged his illegitimate daughter, Violet Welsh. But society in Regency England is unforgiving to members of the aristocracy who marry their mistresses, and Lord Kelly, as well as Lady Kelly and their daughter, Violet, are shunned by most of society except for a few close friends.