This is a clean regency romance, the first of a series of four books concerning four siblings, the Richmond.
The siblings had lost both their parents at a very young age: the eldest, a boy, was 4, then came two twin girls aged 2 and, last, a little baby girl. Their father was estranged from his family so, when he and his wife died, the children sent to a foundlings hospital. Their uncle (an earl) found out about the boy's existence and, having no children of his own, adopted him and passed him off as his own son, thus providing an heir to the earldom (the rightful heir being a wastrel). However, the earl didn't know of the girls' existence, so they were left to grow as orphans, separated from each other and not knowing who they really were. The books in the series tell us what happens when they are reunited 18 years later, and how they each find love. Thus told, the premise for the series sounds a bit far fetched, but the authors make a credible job of justifying things.
In this first story, the eldest brother (now a viscount) discovers one of the twins, Adelaide, working as a maid in a house he's visiting. He "rescues" her and brings her home, to live the life of an earl's niece. Originally enough, the plot doesn't proceed in the usual "Cinderella style", with the protagonist very happy in her new luxurious life, turning into a diamond of the first water and catching the eye of some dashing suitor. Instead, the ex-maid finds it difficult to adjust to her new situation and her new family, who in turn don't quite know how to handle her. I must confess I liked this point of view, perhaps more realistic and certainly not that usual in historical romances (at least, not in the ones I've read).
Intertwined with her adjustment to her new life and family is the love story with a friend of the family, another earl, with some misunderstandings and obstacles before they reach their happy ending. He makes a good romantic hero, although it is sometimes difficult to understand what's going on in his head or what he's feeling, because the story is narrated in third person from her point of view. Having access to her thoughts and feelings helps the reader to feel her anguish, fears... Still, it's hard to understand her sometimes and, although she's supposed to be daring and independent, at certain points of the story she mostly comes out as rash and irresponsible. So, at least for me, the characters' portrayal could have been better, and, with it, the romance could have been more gradual and believable.
Overall, this book would fall between 3 and 4 stars. But, since it has some original points, the writing is quite decent, there are no obvious historical blunders and it makes an entertaining read, I lean towards the 4 stars.