This one was a pretty good conclusion to the series. Though the fact that Isabel kept exploding on everyone throughout the series really bugged me, this book took the cake. First of all, more jumping from brother to brother again. Why. Why. Just why? Brothers aren't interchangeable like the same tank top but in a different colour!
Second of all, even though Jeremiah and Isabel were adorable as a couple, they had many many many flaws and obviously wouldn't work in the long term, because who just gets married at 19? I felt like that was quite a poor plot device. Also, one person cheating on the other is the second WORST plot device in the history of literature (after miscommunication). Why would you sabotage their relationship on purpose? Just so Conrad could get the girl?
Ugh.
Other than that, it really was a nice conclusion. It mentioned things from the previous books and it tied all the loose ends together pretty well.