Jennifer Ashley's "Rules for a Proper Governess" (MacKenzie/McBride series #7)

Not bad, but not great either. All the MacKenzie/McBride men are basically the same character, with the exception of Ian MacKenzie, and the females are all pretty similar too, especially when they re-appear as ancillary characters in later books. Better stories with the lower-class thieving heroine snagging the rich upper-class hero have been written, e.g. Meredith Duran's "A Lady's Lesson in Scandal" and Julie Anne Long's "To Love a Thief".