The Whole Guy Thing is actually written for a much younger (say 5 years younger) audience. But it really doesn't matter what age you are because the principals in here are timeless. Nancy Rue covers things like if it's possible to just be friends, dating and relationships and of course, the various boy-girl dramas that take place in real life.
What I like about the book is that it's very focused on having a relationship with God, and to use that a guideline on how you should behave towards guys. In fact, my favourite piece of advice appears in chapter one - "take time every day to talk to God about this stuff." This book doesn't focus on how to get a guy, or how you don't need one, rather tries to show how you should approach this in a Godly way, and how your feelings don't have to be suppressed in an attempt to be Godly.
The book itself is very easy to read. It's written in a conversational tone of voice and is very well structured. There are things like quizzes (which will definitely appeal to all girls, especially the younger ones), a "twitter version" that summarises each chapter into less that 140 characters, a section on how to approach this with your parents and so on and so forth.
Probably because it's written for tween/teen girls to read, this book is quite short. But, don't let that deceive you, it contains a lot of information, all of it written in a way that reminds me of a wise, older mentor. And what is most interesting is how the book doesn't prescribe a set of rules (like courtship or dating or whatever is going on). Instead, it centers on getting girls to make the right, Godly decisions, treating them like mature adults instead of little kids who can't handle responsibility. Isn't that great?
Disclaimer: I received a free copy of the book from the publisher in exchange for a free and honest review.