Okay, guys, please, don't shoot me, I know I'm going to have to explain this one ;) 
 There was really nothing wrong with this book, except that it suspiciously reminded me of Gone with the Wind by Margaret Mitchell in so many ways that I found it distracting, and after I was about 30% into the book, I caught myself not so much enjoying the story as counting the similarities. And there were a lot. They are in small details and in bigger things, and really everywhere. I've read GWTW over 5 times, so I know this book inside out, and it seemed like Lisa Kleypas pulled scenes and ideas and dialogues, changed them slightly and inserted randomly into her book. For example, do you remember the ring Rhett Butler brought Scarlett from his trip to England prior to their engagement, the one with a diamond so big it was embarrassing? Here you have it in SoaSN too, when Simon Hunt bought a five-karat diamond ring and other ladies were saying about Annabelle "How smug she is, flaunting that vulgar diamond on her finger...". 
 A small thing, you will probably argue? Yes, it is, but they are really EVERYWHERE in this book. 
 It's the character of Simon Hunt and his piratical looks, his physicality, his attitude, his business and the company he keeps, his set of mind, how high English society snubs him, how he fits neither with his family nor with the peers. The way he was after Annabelle for two years, unsuccessfully trying to capture her romantic attention. It's how he said he was not the marrying kind and offered her to be his mistress in exchange for his financial support, and how he had a way with children. 
 There was even this little episode when Annabelle was sick and barfed in Hunt's presence. Do you remember that scene when Scarlett was pregnant with Frank's child and riding with Rhett a carriage, and he watched her throw up too? This. And how both female heroines felt mortified and embarrassed after the incidents? 
 How Hunt told Annabelle that she was never going to be happy with Lord Kendall, because they were different people and valued different things in life. 
 By the way Lord Kendall = Ashley Wilkes, anyone? A shy, gentle lord who valued calm and quite and, gasp, books, albeit this time horticultural ones. 
 The honeymoon, and how Annabelle loved to eat all those delicacies, how they attended parties and she noticed that other women paid so much attention to her husband that it made her proud and a bit jealous. 
 Even their first quarrel (or cold treatment, really) during that one day on the honeymoon. 
 And how peers and her former friends started avoiding Annabelle's company after she married Simon Hunt. 
 And the climbers of the new English society are definitely yankees in the after-war South, where nobility and peers are definitely confederates. In every little detail. 
 And I could go on and on and on. You get what I mean. 
 So basically, if you rehash Rhett Butler and Scarlett O'Hara's love/hate story, put in a shorter time period of 2 years instead of 12, touch just the tip of that iceberg and give it a HEA and some sex scenes, you get Secrets of a Summer Night by Lisa Kleypas. 
 And this is exactly why I couldn't rate this book higher. I have to add, while I appreciate steamy sex in a book just as much as anyone else, this time I was sick with a fever and couldn't care less about sex, so it also didn't up my rating. Kidding, because I never let sex in stories throw me off track. 
 That being said, I'm going to read the next installment and hope to like it more.