The Prince is the third book in Tiffany's Original Sinners trilogy.

Her only weakness, his deepest desire 
Two worlds of wealth and passion call to Nora Sutherlin and, whichever one she chooses, it will be the hardest decision she will ever have to make. Unless someone makes it for her...
Wes Railey is the object of Nora's tamest yet most maddening fantasies, and the one man she cant forget.
He's young.
He's wonderful.
He's also thoroughbred royalty and, reuniting with him in Kentucky, she's in his world now. But this infamous New York dominatrix is no simpering Southern belle, and Nora's dream of fitting into Wesleys world is perpetually at odds with the relentlessly seductive pull of Søren -her owner, her lover, the forever she cannot have.
At least, not completely.