Definitely read the paper edition of this book because a big part of the appeal is the notes and pictures Amy includes, along with the constantly changing song playlist that entertains Amy and Roger as they take a road trip from California to Connecticut.
Amy and Roger meet on their first day of the road trip. Amy is depressed (and has real reason to be) and Roger is pining over his ex-girlfriend.
To me, this book has everything - romance, adventure, and real heartbreak.
I don't want to give away any of the plot because part of the appeal is finding out why Amy can't drive herself to CT and finding out where they go on their detour. This is such a well-written book that I know girls will love!