I really wasn't sure about Emma and Jack getting their HEA. It all worked out, but I really wasn't sure it was going to happen! This book also gives hints to who the other two (Parker and Laurel) will end up with. I'm not completely sure that my guesses are right based on this book but they are good guesses anyway.
In the first book in this series had the commitment phobia reversed from this book. In this book, Jack is the one that's commitment phobic, while Emma is a romantic.