Frustrated for the singular reason of Kev, who would not face his feelings. He would rather play with Win as hewants her one moment then regret it the next, would rather watch her marry another man, than consider the possibility of the two of them together because she is "too good for him".
Pshaw. Let the woman decide that for herself, you rattlebrain. I mean, I love you, you are deliciously brooding, but end this back and forth before I'm tempted to throw something at you. Stop stringing her along (and yourself) with kisses. Just as Win keeps telling him.
Which brings us to our first delight - Win herself. Win is a wholesome, fragile young girl who knows exactly what she wants, even if it won't be easy to get. And that's Kev. Wonderfully opinionated and determined, unafraid where Kev is frightened, she will bring him down with the force of her love alone and god help them all. So, basically, she was a great main character.
Another reason to be delighted? The continuation (and maybe conclusion) of Kev & Cam's search of their background, as well as additional insights into Cam's head.
Most of these type of series never return into the mind of past couples, opting instead to feature them in each other's story but look at it through different eyes. Kleypas veers from that path as she lets us peek into Cam's head often throughout this story as well. And as I love Cam... I consider this a great plus.
Speaking of their background... I loved it (and suspected it), but at the same time I felt like they tied things a little too quickly at the end there. It would've been better if it carried on to the third book, or if parts of it have been revealed sooner so it didn't feel like everything just happened at once due to a stroke of luck.
In general, a great installment in the series, and it sets up yet another future couple that ought to be so fun to explore!