After everything that I've heard, all the raving reviews that I've read, glorifying Lisa Kleypas as being a master when it comes to writing romance, this book fell far short of my expectations. 
 The general plot line of the 4 books of the series is interesting; I like the idea that the four wallflowers make a pact to help each other find a husband. The plot of this particular book was a little less interesting. Annabelle wants a husband who is a peer so she can help to support her family as they have fallen on hard times. It is her fourth season and as such her last before she is considered 'on the shelf'. Simon Hunt wants Annabelle. Always has ever since he first met her (one of the bits I don't like). They end up at a country party together. Cue the wallflowers trying to catch a peer for Annabelle while Hunt tries to convince her she should be his mistress and not a Lord's. 
 I would have preferred to see Simon Hunt really falling in love with Annabelle rather than his emotions towards her already given before the story even really starts. 
 I don't like how Simon's POV is only used 3 or 4 times. Either use it more or don't use it at all. 
 I don't like the informality surrounding Annabelle's mother. She should not be referred to by her Christian name, she should be 'Lady Peyton'. 
 The story went on too long. Almost all of the part after the wedding served only to include several sex scenes. They weren't even good sex scenes. They came too quickly one after the other so they were unable to really capture my attention. I even found myself skim-reading one! Not good in a romance. 
 The ending itself, from the visit to the locomotive works on, was good. I really enjoyed it. But it was let down by the 50+ pages of waffle that came before. 
 Ultimately, not overly impressed. I'm not sure whether I'll bother with the rest of the series.