I have a serious love/hate relationship with this book. 
 The book starts off with Jeanette Brantford's wedding to the Duke of Raeburn, Adrian Winter. At the last possible second, she decides that she no longer wants to get married (since she doesn't like Adrian anyway, plus there's the fact that it's revealed later on that she has a thing going on with someone else entirely), and thus employs her identical twin sister, Violet to take her place. Violet protests at first, but proves that she isn't hard to convince after Jeanette bandies around the fact that their family is in need of the money that the duke can provide. There's also the small fact that Violet is completely and absolutely in love with Adrian and has been for a long time. 
 This is where I really walk down the line between love and hate (...aaaand now the song is stuck in my head - dammit). While the concept of the book is interesting, there's just something a little off-putting about someone walking into a marriage knowing full well the level of their deception. Adrian, of course, notices the differences between the woman he courted and the woman he married; there have even been a few times where he compared 'Jeanette' to her quiet, more reserved sister. However, instead of delving into his suspicions, he tells himself that he's crazy and all it is - is that Jeanette is falling comfortably into the role of his wife. That marriage has completely changed her for the better. The entire first half of the book is dedicated to the deception, where Violet acknowledges that what she's doing wrong and yet, doesn't want to tell the truth. 
 Adrian doesn't find the truth until nearly to the end of the book and before that, his own brother knows the truth after realizing that Violet isn't who she said she was. She implores his brother, Kit, to keep her secret, however in exchange for helping him with his studies and their bargain convinces Adrian that somehow, the two are having an affair. And yet, instead of coming out and telling the truth, Violet and Kit allow Adrian to believe the whole sorry thing. It's just ridiculous. 
 Naturally, they get their happy-ever-after, with a few minor hiccups before then, but as much as I liked the book, I don't agree with how the characters handled the information. And I hate how easily the author had Adrian forgive the deceit that was given to him from the beginning. I honestly cannot think of anyone who would be able to forgive that sort of thing, no matter how much in love they are.