SISTER BEAR started a thread a few weeks back regarding good easy to read books on Hashkafah…
I just purchased a fantastic book. It is called On The Derech by Rabbi YY Rubinstein.
Its easy to read, the chapters are short and all the topics are real important issues that all teens as well as all Jews have to grapple with in todays times. I think you will really like this book.
http://www.targum.com/product.php/1215/on-the-derech