The Millionaire's Misbehaving Mistress (Harlequin Presents)

As Dallas's most eligible bachelor and heir to his family's fortune, billionaire Will Harrison knows how to handle the paparazzi-but his little sister Evie is a worry....

Miss Behavior, etiquette expert Gwen Sawyer, has only three weeks to work her magic on Evie before a society ball, and so moves into Will's luxurious penthouse. However, she discovers too late that etiquette is the last thing on devilishly handsome Will's mind....