Very informative and plainly written catechism of the Catholic church. Having been raised in the faith I've spent many years as a fallen away Catholic. Though I haven't had a resurgence of spirituality I do have a quite high opinion of both the church, its intellectual history and its theology.
This isn't exactly Thomas Aquainas or St Augustine but what it is are simple and well thought out answers to what the church believes and why it conducts itself the way it does. Interesting reading and highly recommended.
This book answered all of the questions that I had about the Catholic Church. I am currently in RCIA, and found this book very helpful and easy to read.